I just posted a simple mod to modify the population to raw production rate, "Population to Raw Production at 0.75 exponent". This is against Crusade patched to 2.31
Name kinda says it all. I find it useful, as the game starts a touch more quicker with the starting production about +1 over the default and the benefits for working towards building planetary population more rewarding.
It's on neuxsmods now here: http://www.nexusmods.com/galacticcivilizations3/mods/117/?