Arm mods on Power armour

I've found the possible arm mods for the power armours to be completely useless as they're all to do with unarmed attacks and as I'm not a manly man who likes to punch things with an iron first i've found no reason to fit them.

Although, I can't think of anything else that would be a good mod for the arms other than melee damage.

Only thoughts so far:

Computers in arms that help to aim

Motor in arm helps to throw things

Flamethrower attachment?