Sure you can. As long as more of us start doing it. When all the talent requires $SPECIFIC_COMPENSATION, then the employers provide it or do without talent.

Anyone taking reduced pay at a startup should have a fairly detailed contract that their lawyer is reviewing already.

Is it really that hard to write "=> also make sure I don't get OnLive'd" when you route the draft to your lawyer?

Sounds like a union to me... Standard contracts. We'll call it American Association of Programmers, or the American Programmer's Association.