There'd be a few things to think about: should the project already exist? If it exists, does the preexisting admin need to be involved with this crowd-source site? If it doesn't exist, should the submitter be the admin of the new project? Should submitters get their reputation from activity already performed on other sites?
Maybe a pledge system, where the submitter and pledgers agree to begin once a certain number of people pledge, and those pledges should be recorded to see if they're followed through. The site should aim to take a project from idea to completion. The submitter could set a number of roles that developers can choose to fulfill.
Even some crowd-sourced funding could work. Funding could be introduced or opened at some point, say from the beginning, but with activity picking up as a project progresses. Imagine Diaspora using the site.
Maybe a pledge system, where the submitter and pledgers agree to begin once a certain number of people pledge, and those pledges should be recorded to see if they're followed through. The site should aim to take a project from idea to completion. The submitter could set a number of roles that developers can choose to fulfill.
Even some crowd-sourced funding could work. Funding could be introduced or opened at some point, say from the beginning, but with activity picking up as a project progresses. Imagine Diaspora using the site.