I've adopted the following house rule (it's similar);
Concentration - Through concentration, a force user enters a state of calm, allowing them to reflect on their connection to the Force and more deeply explore their connection to it. By doing nothing else in the round, when making a check to activate a Force Power, the user may concentrate to accomplish one of the following things; Convert a Dark Side pip to a Light Side pip for no conflict (through reflection on the purity of her actions), add a Light Side pip to the result (through a strengthened connection with the Force), or add a boost die to any Opposed check that is taken alongside the Force Power use.
If I'm reading this correctly the mechanics of this are: spend a Manoeuvre and get to do the same as flipping a DP and taking a Conflict point, adding a Force Pip, or a Boost die. Did I miss something because as you have it here the PC gets a huge boon with no real downside.
Maybe you should consider requiring Discipline roll outside of Combat and a Discipline Action while in Combat (Skill rolls are considered an Action during Combat).
Edited by FuriousGreg