> no sound
I'll dabble with that eventually
> moving and accidentally moved my mouse over a guy, I'd start trying to attack that guy instead
Yeah, there's an actual reason for that - before I had the screen zoom i/o function and fullscreen scaling, sprites were really small, and click-to-lock-on needed some getting used to so I made 'single-target and M1 skills when held down and hover over target to lock-on.' I'm kinda used to it now. For an alternative you can place [Move] basic skill on [M1] and assign another hotbar slot with the attack skill.
> weapon swap
It's [Tab], you can read about the hotkeys in the games description.