Contributing to this project is more than welcome. The easiest way is to write your custom scoring functions and pull them for request.
You can write your own scoring function starting from the provided driver.py template. The easiest way is to copy the template folder:
cp -R template/ mynewscoring
In order to call this new scoring function, just use the -s flag:
lightdock 2UUY_rec.pdb 2UUY_lig.pdb 1 10 5 -s mynewscoring