It should be customisable. I had no problem adding that field to window definition.
You might try leaving only USDClass window definiton in file(+externals).
If that doesn't work, can you please provide a window definition as well?
Is it possible to use the parameter --skip-register-on-import with multiple registers, either by using a comma-separated string or by specifying this parameter multiple times in parameters.txt?
Thi...
