Hi! To upvote or downvote a comment, the action bar is placed at the top of the screen. Unfortunately, for large phones, this requires you to stretch your hand as it usually rests near the bottom of the phone because of the home button.
I would like to request a setting to allow the user to decide to place the bar on the bottom versus the top. Users with software navigation buttons (see Nexus and now other phones), the bottom action bar is harder, though, so a setting/toggle/option is preferred.
A discussion we had in /r/Android: http://www.reddit.com/r/Android/comments/1fnkyh/action_bar_on_top_sucks_for_large_phones/
the action bar being on top makes me reluctant to upvote things occasionally because of how much of a pain it is to reach up there every time, when otherwise my thumb never makes the awkward trip up there (at least to vote..)
Voting options now appear under each comment. I'll not be adding an option to move the entire ActionBar.