forest frequency, size, richness - map generator options

[HL65536]

It would be very nice to have an option for frequency, size and richness of forests, where richness is tree density.
It would also be nice to directly insert a number for frequency, size and richness of every resource, like in the customized world options of minecraft.
Achievements could be disabled if someone inserts values out of the usual very small-very big range.

[ssilk]

Added to viewtopic.php?f=80&t=16592 Game Setup, Game Configuration, Init Screen, Mod-Config