I am aware about using 'Enter', but then I have to wait for the page to reload. And depending on your browser (and potentially some other things), the page may not be reloaded at exactly the same place you were before you pressed 'Enter', so you lose your place (can be a problem if the thread is really long). Same problem if you go to the end of the page and click the button.

Minor annoyances, yes, but I think there's a fairly simple solution.

UI can often be a matter of opinion or personal taste, but surely it makes sense to allow a user to make a decision on voting for a particular reply while they're viewing it, and not have to scroll to find where they were?

(Actually, the scrolling issue could be fixed if the page redirected correctly, and anchors were used, but I'd still like to at least see a button next to the voting radio buttons).