Put bard songs on separate timers.
Put items in the game that adds to the songs. Something like adding +1 to the attack portion of Inspire Courage is played. Kind of like a potentcy item but for bard songs.
If a third tier of spellsinger is being thought of, add a song that adds to spell penetration. Doesn't have to be a group buff.
Put a way to store money in the shared bank and each character bank. I'd even pay for this option. Not as much as a bank tab since it's uses are not as great but I would like a better way to transfer my plat between characters.
Remembered the other stuff...
Put compass directions on the map. Some people don't to know north, south, east, west.
Allow individual voice volume control. Let me be able to right click on player names in the party list and bring up a slider to adjust things.
Allow me to arrange the party list to my preference so that if I'm responsible for healing a particular person, I can set them to F2 instead of having them at F8.
Add colors to our dots on the maps so that I can say group on the red dot and they group on the red dot.
Add the ability to form more than 2 teams. Red and blue team isn't enough so I don't care to use it.
If I remember more stuff on down time I'll update.