OK, logged user name now added to the list of dynamic text objects, and is working nicely.
There is also a special dynamic text object that call external application/scripts, passing to them, as parameter, the filename, and use for stamp text the returned text output. With it users will be able to easily extended the dynamic text stamp possibilities.
Sorry but I can't give you an accurate new version release date because I don't know myself. End of month, beginning of next...
Sometimes I release beta versions to registered, and very participative, users who submitted a feature request/enhancement so they can help me testing/polish it, but never as trialware.
If you can't wait for the new release, and you need to rapidly find another solution, thank you very much for passing by and share your ideas.