Sometimes in the media you see a Force user concentrating to do something, and it takes more time than "a round", or you see them "reach deep" and let off something more potent than usual. Let's say you have the upgrades that would allow you to apply 4 pips to a power, but you only have FR1...what to do?
I'm wondering if there can't be a mechanic to allow the Force user to accumulate pips. I'm drawing on the predecessor here, because WFRP 3 had such a mechanic. In this case, perhaps the user has to roll Discipline (in addition to anything else) to retain Force pips from one round to another, maybe:
Discipline check with a base difficulty equal to Force pips being held from previous round, with an upgrade for each pip over the user's current FR (which is their FR minus any commitments).
Round 1 the FR1 user generates a single pip. They want to build up to four pips.
Round 2 requires a Discipline check against P. They luck out and roll two pips, for a new total of three.
Round 3 requires a Discipline check against RRP: PPP for having 3 pips, upgraded twice because it's two higher than their FR.
Threats or Despair could disorient or stagger, and cause a loss of pips-per-Threat, or all pips on a Despair.
I'm not saying such a mechanic *is* needed...perhaps if you only have FR1, then you have to suck it up. But could this be useful at all? And if so, could it be too easily abused?