Two ideas/requests that I can think of off the top of my head.
1. A Lode Runner 3-D level editor for the Nintendo 64.
I love puzzle games and we all know when there is a level editor for a puzzle game the possibilities pretty much become endless. I personally don't know any programming languages but if someone could take a shot at making a level editor or at least see ifs its possible that would be amazing. I also don't that it would be all that hard considering that every world is just made up of a bunch a cubes.
2. Capcom vs SNK 2 character port over to Capcom vs SNK 1 on Dreamcast
This is a hack that must be made during my lifetime. I don't care even if I have to do it myself or actually commission this work out to another rom hacker but the idea is pretty basic and I don't see why it can't happen. In short, CvS1 for the DC is one of my all time favorite games, in my eyes its pretty much perfect. When CvS2 came out I did NOT like it at all but it does feather some new characters. The only characters I believe are worth anything are Rock and Haohmaru and maybe Athena or Hibiki or Yun too. I never liked the fact that Eagle, Maki, Rolento, Dan and Chang were incorporated into the game, plus I believe that the 2-D drawn character sprites look better in the backgrounds in CvS1 rather than the mismatched 3-D backgrounds in CvS2.
So the idea is to take a few selected characters from CvS2 and port them into CvS1. If only 1 character could be ported over it would have to be Rock. CvS1 needs to have Rock in it.
The hack would have to include all of character's animation frames, sounds and character selection artwork. Since all these exist in CvS2 I see no reason why it can't happen.