I have been rolling a couple two weapon melee types lately and have found that 7 weapon sets (at least for me) still is just not enough.
Any chance we could make something like the AH posting window for weapon sets. For example you would put your weapons into the box, then pull it down to your hotbar. Wash, rinse, repeat.
When time comes you don't need said weapon set anymore just pull it off your hotbar. I see no reson you could not have as many weapon sets as you have room then.
Maybe I don't have a clue, but I can't imagine this would be THAT tough to code and the the Dev's wouldn't have to hear people like me whine and moan about weapon sets any longer.