Yes, I could agree on this point. But you have to valutate if you want to advocate a function to give a form to the project, versus let him plasmate himself. It the users don't engage let's fix the function or remove it, not fear. On the tecnical side you can use tags to star the post, of course; the critical point is give them visibility in the profile via a proper section/button. However I think that a checkbox is minimalist (KISS) and the migration to a tags system, if needed, is trivial.