I'm not even sure it's worth submitting patches to Diaspora, both because of the fundamental problems with the code, but also because of their "Open Core" licensing scheme (AGPL + contributor agreement): http://www.ebb.org/bkuhn/blog/2009/10/16/open-core-shareware...
Looking through the code, it looks like Diaspora is really just putting a front end and "aspects" on top of OStatus. I think it might be good at this point to just scrap the Diaspora code and start over from the basics with a good OStatus-based reference implementation in Rails.
At its core, the real value in something like Diaspora is its protocols. If you disagree with the license, or the language they chose, why not make your own implementation from scratch that can federate with it.
If it survives, I might do this... I think their approach is fine for rolling out a private enterprise FB or creating an alternative hosting solution, but I'd like to see an even more decentralized solution. Ruby isn't a good choice of language for mobile, or native compiled "IJW out of the box" deployable solutions.
Looking through the code, it looks like Diaspora is really just putting a front end and "aspects" on top of OStatus. I think it might be good at this point to just scrap the Diaspora code and start over from the basics with a good OStatus-based reference implementation in Rails.