Check out this guy. He built what calls a "carb cheater". It's a Chevy Idle Air Controller (IAC) from a TBI setup, and is essentially a very controlled vacuum leak. Using it, he's been able to get some pretty impressive feats done. Might be the level of hackery you're looking for. It doesn't do timing, but this is the right kind of tinkering you're looking for, I think.

https://www.youtube.com/watch?v=FwhMz2kR4pw