diff --git a/include/parts.h b/include/parts.h
index e814436..db6ff6b 100644
--- a/include/parts.h
+++ b/include/parts.h
@@ -131,6 +131,7 @@ void PE_set_active_controller(int controller_no);
 int PE_get_active_controller(void);
 int PE_get_system_controller(void);
 void PE_parts_set_want_save(int parts_no, bool want_save);
+bool PE_save_thumbnail(struct string *filename, int reduction_factor);
 bool PE_init_parts_movie(int parts_no, int width, int height, int bg_r, int bg_g, int bg_b, int state);
 int PE_get_movie_sprite(int parts_no, int state);
 float PE_parts_get_absolute_x(int parts_no);
@@ -247,6 +248,7 @@ void PE_SeekEndMotion(void);
 void PE_UpdateMotionTime(int time, bool skip);
 bool PE_IsMotion(void);
 int PE_GetMotionEndTime(void);
+void PE_PauseMotion(bool pause);
 
 // text.c
 bool PE_SetText(int parts_no, struct string *text, int state);
diff --git a/src/hll/ChipmunkSpriteEngine.c b/src/hll/ChipmunkSpriteEngine.c
index b44f96d..c656578 100644
--- a/src/hll/ChipmunkSpriteEngine.c
+++ b/src/hll/ChipmunkSpriteEngine.c
@@ -111,8 +111,8 @@ HLL_WARN_UNIMPLEMENTED(0, int,  ChipmunkSpriteEngine, SP_SetBrightness, int sp_n
 HLL_WARN_UNIMPLEMENTED(0, int,  ChipmunkSpriteEngine, SP_GetBrightness, int sp_no);
 
 static bool keep_previous_view = true;
-HLL_WARN_UNIMPLEMENTED((keep_previous_view = on, true), bool, ChipmunkSpriteEngine, KeepPreviousView_SetMode, bool on);
-HLL_WARN_UNIMPLEMENTED(keep_previous_view, bool, ChipmunkSpriteEngine, KeepPreviousView_GetMode);
+HLL_QUIET_UNIMPLEMENTED((keep_previous_view = on, true), bool, ChipmunkSpriteEngine, KeepPreviousView_SetMode, bool on);
+HLL_QUIET_UNIMPLEMENTED(keep_previous_view, bool, ChipmunkSpriteEngine, KeepPreviousView_GetMode);
 HLL_QUIET_UNIMPLEMENTED(false, bool, ChipmunkSpriteEngine, KeepPreviousView);
 
 static void ChipmunkSpriteEngine_Sleep(void)
diff --git a/src/hll/PartsEngine.c b/src/hll/PartsEngine.c
index 08d445c..3d758e4 100644
--- a/src/hll/PartsEngine.c
+++ b/src/hll/PartsEngine.c
@@ -260,10 +260,19 @@ static int PartsEngine_PartsFunc(int func_id, struct page **array_int,
 		REQUIRE_INTS(1);
 		ints[0].i = PE_get_system_controller();
 		return 1;
+	case 3:  // void PauseMotion(bool pause)
+		REQUIRE_INTS(1);
+		PE_PauseMotion(!!ints[0].i);
+		return 1;
 	case 4:  // void SetWantSave(int parts_no, bool want_save)
 		REQUIRE_INTS(2);
 		PE_parts_set_want_save(ints[0].i, !!ints[1].i);
 		return 1;
+	case 6:  // bool SaveThumbnail(string filename, int reduction_factor)
+		REQUIRE_INTS(2);
+		REQUIRE_STRINGS(1);
+		ints[1].i = PE_save_thumbnail(heap_get_string(strings[0].i), ints[0].i);
+		return 1;
 	case 40:  // float PARTS_GetAbsoluteX(int number)
 		REQUIRE_INTS(1);
 		REQUIRE_FLOATS(1);
diff --git a/src/hll/SACT2.c b/src/hll/SACT2.c
index 19ca021..94fb24d 100644
--- a/src/hll/SACT2.c
+++ b/src/hll/SACT2.c
@@ -1031,6 +1031,7 @@ int sact_TRANS_Begin(int type)
 
 int sact_TRANS_Update(float rate)
 {
+	sprite_call_plugins();
 	if (scene_is_dirty)
 		scene_render();
 	return effect_update(rate);
diff --git a/src/hll/StoatSpriteEngine.c b/src/hll/StoatSpriteEngine.c
index cd9b1b9..11e92e6 100644
--- a/src/hll/StoatSpriteEngine.c
+++ b/src/hll/StoatSpriteEngine.c
@@ -188,8 +188,8 @@ float StoatSpriteEngine_FPS_Get(void)
 HLL_WARN_UNIMPLEMENTED( , void, StoatSpriteEngine, VIEW_SetOffsetPos, int x, int y);
 
 static bool keep_previous_view = true;
-HLL_WARN_UNIMPLEMENTED((keep_previous_view = on, true), bool, StoatSpriteEngine, KeepPreviousView_SetMode, bool on);
-HLL_WARN_UNIMPLEMENTED(keep_previous_view, bool, StoatSpriteEngine, KeepPreviousView_GetMode);
+HLL_QUIET_UNIMPLEMENTED((keep_previous_view = on, true), bool, StoatSpriteEngine, KeepPreviousView_SetMode, bool on);
+HLL_QUIET_UNIMPLEMENTED(keep_previous_view, bool, StoatSpriteEngine, KeepPreviousView_GetMode);
 
 /*
  * NOTE: The multisprite "type" alters the behavior of the multisprite functions.
diff --git a/src/parts/motion.c b/src/parts/motion.c
index 13a593f..2d29d0d 100644
--- a/src/parts/motion.c
+++ b/src/parts/motion.c
@@ -38,6 +38,8 @@ static struct parts_motion_list global_motion_list =
 
 // true after call to BeginMotion until the motion ends or EndMotion is called
 static bool is_motion = false;
+// true while the motion is paused (time does not advance)
+static bool is_motion_paused = false;
 // the elapsed time of the current motion
 static int motion_t = 0;
 // the end time of the current motion
@@ -498,6 +500,7 @@ void PE_BeginMotion(void)
 	// FIXME: starting a motion seems to clear non-default states
 	motion_t = 0;
 	is_motion = true;
+	is_motion_paused = false;
 	parts_init_all_motion();
 }
 
@@ -508,6 +511,7 @@ void PE_EndMotion(void)
 	motion_t = 0;
 	motion_end_t = 0;
 	is_motion = false;
+	is_motion_paused = false;
 	parts_fini_all_motion();
 }
 
@@ -531,6 +535,8 @@ void PE_SeekEndMotion(void)
 void PE_UpdateMotionTime(int time, possibly_unused bool skip)
 {
 	// TODO: use skip
+	if (is_motion_paused)
+		return;
 	PE_SetMotionTime(motion_t + time);
 }
 
@@ -543,3 +549,20 @@ int PE_GetMotionEndTime(void)
 {
 	return motion_end_t;
 }
+
+void PE_PauseMotion(bool pause)
+{
+	if (parts_began_click)
+		return;
+	if (!is_motion)
+		return;
+	if (is_motion_paused == pause)
+		return;
+	is_motion_paused = pause;
+
+	// While paused, the per-frame advance stops updating the whole-screen
+	// vibration offset. Reset it to the origin so the screen doesn't stay
+	// stuck at the last shake position.
+	if (pause)
+		parts_set_global_pos((Point){ 0, 0 });
+}
diff --git a/src/parts/parts.c b/src/parts/parts.c
index fd8ec8f..9279277 100644
--- a/src/parts/parts.c
+++ b/src/parts/parts.c
@@ -40,7 +40,6 @@ struct parts_controller_stack ctrl_stack;
 bool parts_multi_controller;
 
 static void ctrl_stack_init(void);
-static void ctrl_stack_fini(void);
 
 #define PARTS_PARAMS_INITIALIZER (struct parts_params) { \
 	.z = 1, \
@@ -1062,7 +1061,7 @@ void PE_Reset(void)
 {
 	PE_ReleaseAllParts();
 	PE_ReleaseMessage();
-	ctrl_stack_fini();
+	ctrl_stack_init();
 	sact_ModuleFini();
 }
 
@@ -1955,6 +1954,44 @@ bool PE_SetThumbnailMode(bool mode)
 	return true;
 }
 
+bool PE_save_thumbnail(struct string *filename, int reduction_factor)
+{
+	if (reduction_factor < 1)
+		reduction_factor = 1;
+
+	Texture *src = gfx_main_surface();
+	int w = src->w / reduction_factor;
+	int h = src->h / reduction_factor;
+
+	// Downscale by repeatedly halving until we are within a factor of two of
+	// the target size, then do the final stretch. This avoids the aliasing
+	// that a single bilinear minification would otherwise produce.
+	Texture tmp, *cur = src;
+	bool have_tmp = false;
+	while (cur->w / 2 > w && cur->h / 2 > h) {
+		Texture next;
+		gfx_init_texture_blank(&next, cur->w / 2, cur->h / 2);
+		gfx_copy_stretch_with_alpha_map(&next, 0, 0, next.w, next.h, cur, 0, 0, cur->w, cur->h);
+		if (have_tmp)
+			gfx_delete_texture(&tmp);
+		tmp = next;
+		cur = &tmp;
+		have_tmp = true;
+	}
+
+	Texture dst;
+	gfx_init_texture_blank(&dst, w, h);
+	gfx_copy_stretch_with_alpha_map(&dst, 0, 0, w, h, cur, 0, 0, cur->w, cur->h);
+	if (have_tmp)
+		gfx_delete_texture(&tmp);
+
+	char *path = savedir_path(filename->text);
+	int r = gfx_save_texture(&dst, path, ALCG_QNT);
+	free(path);
+	gfx_delete_texture(&dst);
+	return !!r;
+}
+
 void PE_SetInputState(int parts_no, int state)
 {
 	if (!parts_state_valid(--state)) {
@@ -2072,11 +2109,6 @@ static void ctrl_stack_init(void)
 	PE_AddController(-1);
 }
 
-static void ctrl_stack_fini(void)
-{
-	memset(&ctrl_stack, 0, sizeof(ctrl_stack));
-}
-
 // Adds a new controller to the stack and makes it active. The `index`
 // parameter specifies the position in the stack at which to insert the new
 // controller; -1 means "insert directly after the currently active