[galaxy-dev] Hidden history item

Hi all, by default I let my tools produce ("the old way") a logfile of the console and additional running statistics. This is convenient at tool setup and ocassionally for troubleshooting. Anyway I would like to make the corresponding history item hidden. I tried including hidden="true" in the output tag but that does not make any difference. Is this possible at all or only applicable to running workflows? Any pointers appreciated. Alex