This is incorrect.
Power Wrench according to wiki reduces cooldown for Tool Kit Skills not Tool Belt Skills, so Static Discharge cannot be spammed more with that trait. I've not tested this in game, feel free to correct me in I'm wrong.
This and my other recent builds will probably be the last ones and this the last post you'll see from me due to overly draconian mods on this site.
I've no idea why I even signed in, but I think it just bothered me. I did have power wrench myself at one point while running the old SD Rifle build in WvW and was disappointed too when I realized the wording in the trait description was not what I thought it was.
Have fun and say no to censorship.