With one exception... the default 'init values' will always go from 10-4-0-0-0 per systems even when these numbers are changed (or different, including lowest) within a CP.xml file.
Believe me, i tried... and the Homeworlds must have a minimal PQ of 10 while the second planet cannot be lower than PQ4. I sooooo wished for the Fantastic-Four race in CoSH to have a true PQ4 homeworld, since they do have the Thalan tree edges -- plus a few more tiny adjustments to other Super-Heroes starting conditions would have provided some new challenge. Call me a gameplay balance freak! 
As for the initial OP 'request', there **COULD** be an indirect way to control some aspects of PQ ranges for the extremes by fiddling with the old PlanetDescription.xml file since there are some limit fields that maintain such constants. Never tested it though, but i don't see why it shouldn't be possible... this, being for DL or DA only, btw.
