Two things I noticed during trial mode and in Studio:
1. If the driver was installed from the command line, the GUI version of the custom paper size editor isn’t there. I thought the paper size editor wasn’t available in trial mode, but after getting a Studio license it’s still not there.
2. In the command-line version of the paper size editor (inside tpconfig), we can define y scaling, but it won’t save (it always goes back to 10300).