This issue has been around for a long time and behaved the same way on OpenOffice. The RPM package should not clobber the existing psprint.conf file each time an update is performed. For those that use the unmodified print engines it's no big deal, but if you have spent time with customizations and spadmin you can lose lots of work. Requesting please that this file not overwrite if one already exists. I don't believe the file format has change in many years and it should be OK to just create something like psprint.conf.rpmdefault in that folder.
The standard solution is to mark files as %config in the RPM file list.
It seems that it happens when we add add "CONFIGFILE" into the "Style" line into the file metadata in scp2.
Petr Mladek committed a patch related to this issue.
It has been pushed to "master":
do not replace modified psprint.conf from rpm packages (fdo#50307)
Fixed in master for 3.6 release.
Migrating Whiteboard tags to Keywords: (EasyHack DifficultyInteresting SkillScript)