There may be a need to keep old bugs, because some levels have features that revolve around bugs or things that technically shouldn't happen, but do, and people use it to enhance the game. Like what Unknown Rabbit said, a mode for 1.23 where old bugs are included just because it uses that old style.

Sugar Rush in multiplayer is, imho, worthless. I will always wonder why people put food in their battle/CTF/Treasure/Race levels. Coop is a different story. But whatever.

And yes, playing mp3s in Jazz would be -very- nice, but unfortunately people would be including the mp3s with their custom levels which would drastically increase the filesize. Still, support for mp3s would be wonderful.

And speaking of music, another thing I've toyed with in my mind is if the custom music could be written directly into the level, which would be a nice feature since you wouldn't have to use default music or make people download the music seperately. Unfortunately it could potentially increase filesize a lot.

Another nice thing for music would be a drop down box where it lists all the compatable music files in the Jazz2 folder, and gives you a button to browse, and the ability to listen to the music directly in JCS. That would be very, very, convenient.