Rake is rake - it's the amount of money taken out of the pot. I'm not sure what you mean by changing it - if you wanted to make an alternate version you certainly could based on those numbers, you'd just need to define what it meant.
That said due to the currency restrictions we don't have a current PokerStars VPP stat that is working properly for PT3 - though there is one for PT4 that is freely available in our
Warehouse.