Re: Backstab - I do know that Backstab with larger weapons via the Assassin Talent was possible in earlier versions, so it should still be working unless a patch broke it. I've found that the proper positioning of Backstab can be a bit finicky - it's not always clear where you have to stand to be considered in position for a backstab.
I'm guessing you don't get a tool-tip change indicating you'll do a backstab then? Might be a nice GUI idea.
Actually, my idea was to have some kind of chevron in the circle under the enemy, indicating which direction enemies were facing. The only problem with a backstab tooltip is that you need to be in backstab position to see it, and if you aren't, you need to spend another AP to move into the right position.
