No difference at all. I actually am concatenating the subreddits for the URL. It's on my to-do list to allow any number of subreddit per channel. I just haven't figured out an elegant way to do it on the mobile, yet.
I just thought that if you weren't able to vote on posts and comments in the first place (being read-only), maybe the points were not relevant to the 'just reading' experience.
Author here. I haven't had the chance to test Reeddit directly on the Nexus 7, but if the sidebar is hidden, you should be able to see it by swiping to the right or tapping the subreddit name at the top.