Luca, Reason asking and combining with John's requirement is, that I have just today been alpha-testing a plugin being developed by someone i got aquainted with. This plugin allows to make and use relative presets to use while in develop mode.
Initially triggered by the softproof challenge to apply (small) changes to slider settings to get the softproof to match more closely the master, and then to copy these over to softproof VC's of other images with given printer profile. Say for instance for the collection of images for a photo book using a fine-art paper for the pages.
The alpha-test showed that it worked quite well.
An accompagnying plugin was also tested, this one examens a selected series of softproof virtual copies all with the same printer profile and determines for each image the changes made relative to the master and provides a report with min, max and average value for each setting change.
The outcome of the alpha-test was that relative preset plugin worked, and also the statistical analysis of softproof changes did show a repeating pattern for given printer-profile, although not on every slider affected though.
It does bring you closer at home, if needed fine tuning per image to finish it.
The plugin to use presets in a relative mode had some other neat functionality as well which i will write about shortly.