GravityxHammah: Lunar Magic DEFINITELY needs more Layer 3-related editing ability. Separate Luigi GFX would probably be too specific, though.
Thehoundsquad: Again, Layer 3 = yes. Lunar Magic can edit the text in the credits sequence, but it can't do much else with it...I'm not sure what else would be good to add, though.
MarioFan22: Can't it do that already? I thought it could. If not, then I agree.
linkunarre: Um...background objects? Interesting, but I don't know...
cheat-master30: I don't know if that would be possible with the current system of uploading BG data. The overworld uses individual tiles rather than Map16 tiles.
Disarray!: It seems like that *wouldn't* be so hard to do, except for one thing: There are certain tables in SMW that are hardcoded to expect no more than 96 overworld levels ($1EA2 being one example). If we could find a workaround for that (such as making those tables submap-specific and moving them to external RAM on submap change), it could possibly work. But if that were possible, we'd also want to have more than 0x200 total levels.
Also, two things that I have been pushing for have come up again: custom object tooltips and tooltips for the new sprite format that will be used with the new Sprite Tool. People might be at least a little more willing to use things like those if they could see them correctly in Lunar Magic.
I'm working on a hack! Check it out here