I realize not too many people play with movement key controls for melee, but I think it would be a very good addition for those that do. Tapping "W" will allow an up attack/block, tapping "S" will allow a down attack/block, tapping "A" will allow a left side attack/block, and tapping "D" will allow a right side attack/block.
Then just one suggestion for reloading would be to make the reloading a little bit slower when you are moving and maybe a little bit faster if you are standing/crouching still. Currently I am seeing a lot of people getting out of engagements by reloading and walking away. I think there needs to be a system put in place where it is possible to reload on the move, but is discouraged for pvp gameplay.