We use inspiration all the time for rolls. I think part of the reason is that our GM gives every player 1 point at the start of each session. use or lose. So the players will always find a way to use it during the session so they dont lose it. I suppose one workaround would be to create an "Inspiration" action with an effect for each type, ATK, SAV, INIT, CHECK, etc and have them apply before the roll.
I'm pretty sure that there are some elements of how the base ruleset works that checks the clients modifiers before rolling. I dont know what method they are using though. I'll have to dig into it and see if I can find it

