wide system modification in main.xcd

I’m trying to enable system print dialog by default in all users on a linux system.

I’ve found the UseSystemPrintDialog option and I know I can play with registrymodifications.xcu file on each user’s home, but I would like to apply this setting without any user intervention.

In share/registry/main.xcd I can see the same option buy I’m not sure if this is the right place to put my own custom parameters.

I’ve already found sofficerc in /etc but syntax is completely diferent from the xcu files, so I’m a bit lost here.