Yeah, as can be seen from taking a gander in the modding forum, there are a few things in the editor experience than can be smoothed over.
Most of the items I've mentioned above directly relate to some things I'm doing (translation) or would like to do at some point (boss arena mod, vox playback mod) with Aquaria. The vox playback mod is, of course, doable without any of the changes suggested above, but writing text at world locations would improve the interface by allowing me to provide a paginated list of the voice clips without having to create graphics for the text. Not having to confirm exit would also be good, as there's no progress to lose.
*** SOME SPOILERS FOLLOW ***
The boss arena mod is an idea that's been tossed around once or twice in the forums, and that I've been pondering for a while. It would basically allow the player to "configure" Naija, then dive straight into any boss fight from the game. This would be handy for trying out different boss strategies, for example. The map would have a central "hub," with tunnels that branch off of it, each leading to a different boss. The hub would also have three items in it: 1) a "food maker" to allow Naija to load up with any food item in the game, 2) a health adjuster which would set her maximum health at any level, allowing the player to "handicap" themselves however they feel is appropriate, and 3) a place to leave Li. Naija would have access to all forms, costumes and pets immediately from the start, but as you can turn these on or off at will, there's no need to do anything in the hub that would enable/disable these.
Issues with making such a mod, as far as I can tell: 1) the interface for the food maker in particular would be simplified considerably with the ability to write text at specific world locations; 2) the health adjuster would require the ability to change Naija's max health with a method call, which doesn't appear to exist currently; 3) the difficulty in closely reproducing the boss chambers; and 4) the need to accurately reproduce the bosses' scripted behavior.