a mod - that means modification, I guess?
Just imagine an online game, which shall extend functionality.
If you are rebuilding that over and over again, forcing the user to download a huge data packet, they won't be very grateful, I assume.

Nope the user wouldn't have to download the whole game again.
The patching in 3dgs works if you just provide the new .exe file and all modified files which replace the old files.
That should work too.

i've been working on a mod system for things like this, you'll have to set the scripts to be added and run them using the execute function. i'll be finishing it soon, so i'll make sure to give you the mod system as well

thanks, Xarthor, for that hint. - I did not know that, but that might ease my problems definitely. - To take it concrete: This would mean that you just add new *wrs-files with extended functionality, and that's it? Are there any drawbacks and limitations?