Oh my god, an "import from CSV" button would be incredible. I do most of my planning in Excel, so it would be great to be able to just click a button and pull it all into the ROM editor! Also, thanks for fixing the gender thing.
Another request is for an "archive all values" option and an "apply from archive" one to match. I'd like to have PK3DS output a file that contains every single value it CAN modify, and the value of each of those. Then, we can share our ROM hacks without distributing game files themselves!
Also, some "quick scripts" would be nice. I'd like to see one that adds everything from the "egg" and "tutor" list for a Pokémon to its (and its evolution's) Level-Up Movepool at Level 1, so people can access the full movepool from the standard Move Reminder.