nope sry, either get a keyboard that can do it with a hardware macro, or get used to them being on separate keys until blizzard realizes how much they fucked up.
yeah it does, it's basically the only thing that i dont like about the new sub(that and shadow dance having its own little GCD is annoying) thankfully we dont spend that much time outside shadow dance so if you bind backstab on hemo's spot and SS to backstab it wont be much different.