the abilty to scale the UI hotbars as well as already mentioned to make them into rectangles 2x6,3x4,4x3,6x2 would be very helpfull since then i han have my usual 12345qefrzxc mapped in one box to associate with my left hand main spell usage and have another box 3x4 of clickables for my right hand. the ones that are on long cooldowns i usualy click and put on the right side of the screen.

i now have to utilise third of 3 bars to simulate the same effect.