Is there any way to send a stack of items? Like. I want to give a friend of mine my coins but to send them individually is 200 coins... And gift center only does 10 at a time and so does trade. Anyone know of another way or am I just gonna have to grind through with 10 at a time though the gift center?

Grind away, or ask your friend what items they want and buy them with the coins and the send the items. As of yet, there is no way around this though I am pretty confident it has been asked for and suggested. Perhaps as more things get revamped, this too will be taken into consideration.

Depends on what kind of coins you're talking about. If it's sP you can buy sP vouchers. Otherwise, it's trades and sending them to them.