Maybe you should have a "contributions" page where you can post simple tasks others can do for you. Say you want to change a minor functionality, but don't have the time for it, have some person pick up that project, and then return that to you. It would probably hard without open-sourcing the project though, and could be too much of a pain to set up.
There's a good chance that we might open source soon. I always intended to at some point, however there are some other considerations that might make it happen sooner than later. IMO there's a lot of energy and creativity that could be harnessed for the betterment of Hubski, and I'd like to give an outlet for that. The API is an obvious step in that direction. There's a few moving parts here, and I hope to be able to have some specifics for everyone very soon.