One thing this made me think of that could be kinda cool, would be if you could deliberately save a small external file in a quest via scripts (Like saving a .txt file mid-play from ZC, basically) and then load such files in another quest- maybe even have the external file contain a readable variable array that either quest can read/write from. That would be a really cool way to set up things like Oracles-esque linked games, or weird instructions for sequels or connected reactive storylines that track how you did things, etc.

I realize that's a little off-topic from the subject of clearing bitmaps, but, it might be neat to have a deliberate way to carry data from one quest to another, and this is what made me think of it.