[PvK]

Multiple homeworlds will tend to throw things a bit off - it multiplies the rate of reasearch of the whole game, although if you set "high" research costs, the research rate might stay more interesting than the unmodded game. The AI might be at a disadvantage, because I suspect it probably won't be able to scale very well to take advantage of the multiplied resources, but you can help it out by giving it a bonus.

This would be a way to get a Proportions game that seems "as fast" or "faster" than the unmodded games, at least for the time required for humans to develop powerful war fleets. If you wanted to do a PBW game focussing on large-scale combat using the Proportions changes to equipement, fighters, etc, a ten-planet start with high research cost might be a reasonable way to do it.

PvK