A 'MOD' it self as a single subject can be patched by added new content that was not in the previous version.
'MODDING' can, but won't get patched because the amount of work needed to accomplish this.
If a mod no longer works,
1. Extract the modded .rez file
2. Take desired files
3. Find updated file that corresponds with the modded .rez file.
4. Inject into the newly updated .rez file.
5. Load CA and enjoy.
And yes, this does work. I have modded scopes right now played about an hour ago[7•8•10(1am)]