Yes it's
very possible. There's no such thing as locked mods, only locked files.
I've seen some post about how to acclompish this from Tony himself.
It might be smart to take a look at the look at the advanced docs of csm 1.25 and for an update search this forum with keywords like "brain goes boom"
unfortunatly the docs for 1.26 aren't finished yet, but when you've read the advanced docs and the 'brain goes boom' thread, i'm sure you'll be able to figure out the ini's (it's not that hard actually)
There's an easy way and a bit harder way to accomplish this. The easy way means you'll lose configurability and have no track specific cars and the harder way means you'll understand how the mod (and therefore all mods) work and you'll be able to adjust any mod to your needs.
I'd rather have a bottle in front of me than a frontal lobotomy