As the title suggests, I think a good QOL for the Warlock would be to be able to turn Repelling Blast passive on/off within the actual window you select your targets for Edlritch Blast. Currently, you have to toggle it on/off prior to selecting the targets. SO if you select a target, then realize you don't want it, you must cancel out of target selection, toggle the passive, then go back to target selection. Its a bit cumbersome because the passive is only accessible via the 'passives' bar. a nice workaround to this would also be just showing the passives on the right always in a draggable menu. Or on the side, similar to when a Barbarian is raging.