You will have problmes dealing with upcoming missions if you don't spent your skillpoints. You CAN keep your captain's title and rank pins.
That's meaningless, since the NPC dialogue still refers to you as "Rear Admiral, Lower Half" (in full, too, which is a really basic error.
So yeah - either it'll get fixed at some point, or I'll keep playing for as long as I can at Captain level. Ultimately, if it doesn't improve, I don't see why I should force my characters to be 'Admirals' if I don't want, so it'll be the final straw that forces me to quit STO for good.
Besides, I just found a brand new copy of 'Klingon Academy' for £16, which IMO might be the greatest Trek game ever, so it's swings and roundabouts. STO isn't that great a Trek experience at present that I can't look elsewhere for alternatives.