I've had 2 BSOD lockups, but I don't know if it's the game or just coincidence.
Sometimes that Argo upgrades screen will stay up and superimpose on the lance launch screen. No big deal, just go to another area and back and it's fine.

I'm the same. I CT anything I don't want, or if I don't have time to work on it much under pressure.
For something I really want, 2 mechs will have LRM's and possibly PPC's. I hit with the LRM's first, those mechs are mainly to knock them over. 2 mechs go to one side, 2 to the other in case I don't have precise shot ready yet, firing from the side is more likely to hit a single leg than from the front/back.
2 take out the left, 2 take out the right.
I don't usually bother with headshots, they just don't seem to come very often for me...unless I'm receiving.