Energy and Emotes.
Energy:
I think there should be a way to mine/kill and receive energy, other than with coins (just raise up the prices of stuff or make coins rarer/less frequent). Also, what if there was a way to buy mist energy tanks, or obtain them from bosses?
Emotes:
I would like a button that you press and easily see, so you can do instant emotes, how about you?
There is another way to get energy other than with coins; it's called "paying Three Rings with actual money." It is how Three Rings makes money off the game, and they are never, never going to implement a mechanic that'd only undercut themselves. Same goes for Mist; they'll dole them out as special rewards, but make them boss drops and the current all-JK-runs-all-the-time thing becomes a huge drain as players just refill their tanks and start their daily play session over again.
Not fussed about instant emotes, though I suspect it'd clutter an otherwise unobtrusive UI.
dude these suggestions have popped up for a long time now it isnt going to happen