There was some discussion and support in the last thread, which is apparently gone, so here it is again:
Some types of energy will inherently be better when playing on a world that isn't default (lava world, sky world, etc.). To avoid everyone only using geothermals on lava world I'd like to be able to go into a config file and modify the output of geothermal furnaces. Similarly, this would stop people complaining about things being under/overpowered as they could easily just change their own config file to something more "balanced".
Here's an example of what it might look like, doubling solar and halving geothermal.
wind 1
water 1
geothermal 0.5
solar 2
etc.