Won't work. Real life collaboration is hard enough. Having said that, here are a few ways you can mitigate the problem: a) require vesting. If a person does l

Won't work. Real life collaboration is hard enough. Having said that, here are a few ways you can mitigate the problem: a) require vesting. If a person does less than, say, 3 equivalent months of full time work in 2 years, they have no claim. b) automatic time bomb. If no work gets done on it over 12 months continuous, the project files become open source. c) automatic nagging. d) Make sure there's room for advisers, who get compensated with stocks. These people may bring contacts. Roles doesn't help in a start up. Read Steve Blank.