I'd also like to see the option to sell horses. I know I'm never going to use it again since I have 5 VIP mounts... And you should be able to sell it for 1/2 price.
Also, I think there should be a way to GIVE A player money INGAME without farming. I mean what if you had 200 in your profile and he wanted 200? And you don't want to farm for what you already have. Well you can click on them; more actions; give; select ammount (200); and send.
THIS WOULD MAKE MORE PEOPLE FARM AND WORK FOR EACH OTHER. PLUS IF THEY SELL THEIR OLD HORSES, THEY ARE GOING TO BUY SOMETHING ELSE THAT THEY CAN'T RETURN RESULTING IN MORE PROFIT!