Evasive maneuvers switching ability

Hi again all, I've got another idea that i am experimenting with. I have a working ability that cuts power to the engines, leaving enough power to rotate the ship. That power is then put into weapons and shields.

But I have just come across an entity modifier I was unaware of before "ChanceToHitAsDamageTarget", basicly evading weapons fire.

Is it possible to have an ability with 2 sides (am i making sense???), so either its evasive maneuvers with a chance to dodge weapons fire and then click to disable it, cutting engine power and increasing weapons and shields. Then click again to restore power to the engines for the evasive maneuvers "ChanceToHitAsDamageTarget" entity modifier.

Follow the links below for my ability and its buff that i've made and want to modify as specified above. 

Buff --> http://pastebin.com/m178ea500

Ability -->http://pastebin.com/m18327fd9 

I would like to avoid having another ability for this to work.