People keep telling me I just have to hold space to continually jump in Quake, regardless of the version I use, it doesn't happen, I can't find a setting or a bind for it anywhere, I'm fairly sure "_special" doesn't work, what's the deal with autojumping?

Not if only one person is gonna run it.

I believe Higan plays SFC

http://byuu.org/emulation/higan/