I think you pretty much have it sussed Evan...
The only others I can think of, are the little blue button icon (an example of which shows in your pic.) Press that to be taken to the first unread post in the thread. Also, there are the little orange RSS buttons, which show on the Forums tab page.
I've not noticed any others, (unless one counts the Tweet/Facebook/g+1) but I'm sure one of the mods will mention anything we might have missed.