Thanks Skunk.
Since I am house ruling a lot of things your suggestions are helpful.
I am currently considering a combination of some Power Storage items and a quick recovery of POW.
I also wondered about some system to separate POW from Magic Points so a charcter could attack and defend with POW up to 21 but accumulate magic points over 21 to power casting. Any other thoughts would be welcomed.
I should say I have been RPGing since 1980 and played most systems. I like Chaosium RQ2 as a fairly simple system and as an alternative to D20 D&D, which our gaming group plays a lot, but we are not fans of the Glorantha setting. My hope is to have an RQ2 / BRP style system in a D&D type setting mostly to use the vast wealth of scenarios and modules available which I will convert on the fly. I am therefore borrowing bits from all over and house-ruling to have a rule set that I am satisfied with. RAW get house ruled by most groups over time anyway.