You'd need to add the changes into the static settings file, even if you set the basic.cfg file to write only SHC overrides the permissions and loads its own settings. If you wanted to change the cost of say a VIIC/41 you'd need to add this to the static_settings.cfg file:
SUBMARINE_AMMO4|Renown0=x
x is whatever you want the new price to be. To make changes you need to add the heading in brackets [ ] , seperator with the or operator | then the value you want to change.
|