In KMS and JMS they got one automatically with Legend and another from a Hot Time event.
We don't know; nor do we know if we'll get AP resets; nor do we know much about how bad GMS is going to make this stuff.
i have like 9 slots or something too so i don't mind. XDXDXD
not that i planned on making one. but after getting the level 100 weapon, the idea of using a big cannon seems kind of neat so i might give it a try.. even though i haven't tried out like 90% of the classes there are.