Every modern MMO should have move-and-steer functionality! It's the one underrated feature that World Of Warcraft brought to the table, that I feel is almost essential to playing a hotbar-based MMO. Having to hold down a movement key, click on the field, and while holding down the mouse button, drag the mouse -- just for quick mouse turning? No thanks.

Give us the ability to bind a single key that allows us to move forward and turn using the mouse -- without having to bother clicking into the screen and holding down a mouse button.

I can't overstate how important I feel this feature is. It lets players use abilities while jumping and turning with minimal input from gaming peripherals.