Setting pdftops-renderer?

[andreas-gruenbacher]

I'm having issues with the default PDF to PS renderer pdftops in ptouch-driver. As explained in the cups-filters README, the pdftops-renderer print option can be set either per job with lpr -o pdftops-renderer=gs or per queue with lpadmin -o pdftops-renderer-default=gs, which makes those issues go away.

The following posting suggests that there's a way to set pdftops-renderer from PPD files as well. However, the following PPD code has no effect:

*OpenUI *pdftops-renderer: PickOne
*Defaultpdftops-renderer: gs
*pdftops-renderer gs/GhostScript: ""
*CloseUI: *pdftops-renderer

Is there a way to define pdftops-renderer or pdftops-renderer-default in a Foomatic xml file? Note that the print option doesn't add any Foomatic command-line arguments like <arg_substitution> or PostScript code like <arg_postscript>. I couldn't figure out a way to pass printer options from the CUPS PPD Extensions specfication, either. Thanks for any help!