Why not just grant people stock / ownership. Wouldn't most people like to get a smaller guaranteed amount of ownership percentage than some mythical huge number of options which get diluted or become beyond the reach due to AMT? Why don't startups say "here is a low salary, but you get 0.25% of ownership after working for 2-3 years", write a contract and put in it that this person owns 0.25% of the company. They might not be able to sell or cash shares until the exit or the IPO or whatever. But if they leave, they leave, they keep the share, if they stay and work company gets better and bigger they get a bigger piece of the pie and so on.
I am probably missing very obvious things here, but that seems a bit simpler than the complicated scheme with options.