Quote Originally Posted by Seven.the.Hun
region fertility can be messed around with in the desc.strat.txt ...
No, region fertility is set in descr_regions.txt.

If you want to place new resources you'll have to add an correct entry in descr_regions.txt for the appropriate region (I'm not even sure if this is necessary, but you should do it). Then you must add an resource entry in descr_strat.txt with the right coordinates describing a point in the region.