Engineering's main bonus is the fact that you can use "reticulated armor webbing" and get a massive armor boost in your gloves. It will improve your survivability a lot. Get rid of the parry&threat enchant on the gloves. Yours is MUCH better.
Regarding the key binding... you should keybind as much as possible but it really depends on your playstyle. We used to have a tank that didn't use mouse (weird one i know)...
Seriously, all depends on your playstyle above all. Usually having keybinds greatly improves your reaction time.
Stabilized Eternium Scope
Diamond-cut Refractor Scope
Get rid of your gun scope and use either one of those... And unless u got threat problems I would advice you to change the weapon enchant too...