It would be great to have some kind of support for cut-scenes. There is a lot of ways to do this. From video loading (off-line and on-line) to some kind of vector interpolated animation or flash support. Its incredible painful to perform this kind of task today. You have to actually program all the movements, camera movements objects reactions sounds, etc, with the art game and it will never look as good as if were done in after effects or flash. It is simply not a tool for that. It would be great if someone thinks of a plugin to deal with this kind of task.
Don't know if this has been suggested before, but I would love to see something that allows me to change colors in a sprite. I love working with restricted color palettes, and sometimes it would be useful to be able to just say "change sprite color #FF0000 to #0000FF"