Is there a bug in Theme Customizer when it comes to applying changes to wallpapers, after choosing a new theme - or it just doesn't encompass all wallpapers? There are two buttons somewhere at the upper part, about keeping current wallpapers or applying theme's wallpapers. I usually choose "keep current", which works fine with the desktop wallpapers. As per the other four wallpapers (lock screen, media player, clock, app manager), they're always changed to the theme's wallpapers. Maybe this isn't covered by that setting, maybe it's a bug, but it can be annoying sometimes.
Also, is it possible to not have wallpapers at those four locations at all (I presume it would make them load faster)?