I think that at the very least, in time for the next ZC public release, someone should go through the NES quests and fix all the various inconsistencies that have been in there for the longest time. Such as the infamous missing blocks in Aquamentus's room, the "bombs flash the screen" quest rule, and some of the more obscure bits such as the Game Icon palettes and the messed-up continue/retry/save cursor that cropped up since the last public version.
Maybe even load in some Tracker files of the original NES tunes for some more authentic music.
What do you think?