[tonyedgecombe]

You need the user to select paper trays, simplex or duplex, etc. For bigger devices that might include document finishing options. Label printers might have a guillotine. Print/release where you need a pin at the printer to release the document are becoming more prevalent.

All this requires some interaction with the user. IPP Everywhere covers a lot but I'm guessing there will be some niche requirements that it misses.

[pxx]

This happens at a different layer than the printer driver; you just need to modify the postscript.

Paper trays, duplex, duplex with tumble, and cutting are specifiable in postscript; this is `setpagedevice`. Even things like custom stapler options (staple first two pages, etc) can be specified. See something like https://support.hp.com/us-en/document/bpp01888 for docs

[tonyedgecombe]

As I said IPP Everywhere covers a lot but there will always be requirements that haven't been considered.