1. How can we emulate the 64DD?
Your guess is as good as mine. Perhaps support could be added to project64, as it appears that people have already cracked the core (see the recent Project64K for a successful example). I'm no programmer but im sure someone out there is up to the challenge?
2. Integration/ROM dumping
Methinks a frontend where (for an expansion) booting both the ROM and the 64DD image separately sounds too complicated for its own good. How about a joint dump where F-Zero X (JAP) and the 64DD Xpansion pack are dumped and booted together. This has already been done with the combined Sonic 3/Sonic and Knuckles Genesis roms that are floating around every two-bit rom site on the web, so the concept is not a new one. P.S. What's the deal with the Zelda - Master Quest roms that are also out there? How did they come into being?
I know this is a lot of questions but the purpose of this post is simply to get people talking. Talk is good... maybe we can stir up some support for this noble cause