Well, idk if i used the correct terms on the title but,
I just found what this guy did, it seemed very easy and clever, so i thought i would share.
He basically takes a sonoff, cuts power to the output contacts, then shorts them and actually makes them an extra switch where you can connect any open circuit and close it by using the sonoff’s main switch.
Thought it might come handy to the community 
Kudos to Kuzmanic over @ instructables.