Before:
After:
Basically using a Hex editor to modify descr_geography_new.db(doesn't cause a crash, it's the .txt version of the file that does) and Muizers excellent tutorial on battlemap modification for RTW as a guide, I've been able to reduce the general hilliness of maps. This makes mountain maps less insane, and also reduces the amount of hills on maps which should be flatter. Simply put the file in the .zip attatched to this post into your Stainless Steel data folder and load up a battlemap to see the difference.