You don't need to reload with the C, it will never go completely down. It just looks like it will. C basically gives you the perfect amount of focus needed during Lightspeed, to spam RMB + F. I don't know of any changes coming along, but currently Lightspeed is fine for what it is, in my opinion.
Title. I level boosted my Gunslinger, because I didn't know I wouldn't be able to get the memory bells. Would I be able to level up another character, and mail those bells to my Gunslinger?