Just noticed the new forums has some nice keyboard shortcuts which mirror the Gmail shortcuts. These make moving around the interface very quick 
There are what I’ve found so far, I can’t seem to find any official Discourse documentation but they are pretty self explanatory:
[j] and [k] - scroll up and down a thread list
[c] - compose a new thread
[r] - reply to selected post (use [j] & [k] to select)
[e] - edit selected post
[g] then [l] - goto Latest view
[g] then [c] - goto Categories view
[g] then [t][ goto Top posts view
[=] open ‘burger’ menu
[/] search
