: Would this allow films by those spazeroids who use pattern buffers? I'm
: assuming the issues might be similar, although I have no idea how the
: mechanics of loading a saved file differ from loading a level initially.
Short answer: No. Multi-level film playback is simply a matter of restoring what already worked in the original games -- this would be a brand new feature that would take a lot of effort.
To keep track of everything that's going on in a level when you save, the saved-game file basically writes the entire current level out to disk, and loads it all back in when you continue. The film format, on the other hand, just includes a little information about the players and the game, and relies on everything playing out from the map's initial state.
To record from a saved-game, you'd need a new film format, which could capture all that saved-game info so it could be loaded back before the replay starts, along with the code to support it, figure out which type of film you have (original vs. saved-game-style), etc.