Great job! Next item, be able to star issues. That would help a lot and we are able to avoid +1 comments.
I've thought long and hard about the "voting" mechanism, and I am really, really torn. Tons of people writing "+1" is a very aggressive voting mechanism. It is noisy and loud, which I think is a desirable trait for some issues on open source projects. There are lots of projects with awesome developers that listen to their users and are commendable souls. There are also lots of projects with developers that don't give…
Why does it matter if it is a simple counter? It'll tell you exactly the same information, with a lot less cluster. And it'll help people reading through issues that are littered with it.
Personally I think having a +1 counter is a win-win solution. And I detest all the +1 comment spam in issue threads, it is noisy and doesn't contribute to the conversation.
Until then, why not create a bot that deletes all +1 posts but edits the main post with a counter of +1s?