No, it only fires when the attack is used, and when the proc actually fires. I never put it in a build because mids likes to keep it on and it grossly overexaggerates your global recharge. Even if you were to spam kick it wouldn't be on all the time. Build is like 24 seconds away from perma hasten when you turn that off. There could be some good pros from having perma hasten, but I haven't found a need for it on axe/sd. It is end heavy as is and a hasten crash isn't gonna help. Having Active Defense perma double stacked does help with DDR, which I would get on a Tank, but on a scrap, eh, its not end of the world only having it single stacked.
My build isn't final, and I haven't respec'd to it either yet. I may throw and extra recharge into AD if I can find slot. Kinda want to get rid of an attack myself as kinda like new LBE and slotting/proccing potential.