Of course we need this, too. Who agrees with me?
Thank you everyone for your input and feedback. The citation helper has been added to this site.
I suspect citation support would be a good fit here, but I don't have an objective overview of your content or a sense if anybody would actually use this to make that case. The best way I know to make this happen is is to demonstrate a need for citations in actual practice. I'm basing that off how we decide if a site needs features like LaTeX support (for example).
I would suggest compiling a collection of posts below which would be markedly improved with citation support. If the benefit to this site can be demonstrated substantively, I can send it off to the folks who can make that happen.
Some posts where this would be helpful:
First some of my own answers; in some cases I used the citation helper on MathOverflow and pasted it into CSTheory, but that's a bit inconvenient.
Next, the highest voted questions on CSTheory are often asking for references or sources for results: