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The way CVS tagging is currently set up (in particular, the script $CVSROOT/CVSROOT/tagger), you would have to be logged in as glast or glastrm to run the script in "for real" mode.
Proposal: Modify tagger script to allow creation and deletion of tmp tags with names satisfying a pattern. Should be something like HEAD pattern except replace HEAD with string HEADtmp, possibly HEADtmp<stuff> where <stuff> is an arbitrary and optional alphanumeric string if, e.g., we want to distinguish different attempts of creating HEAD of a particular version.
Certain assumptions are hard-coded in the script when, ideally, they should come from the RM database: for example, which container packages are active, exact format of tags. These things don't change very fast, if at all, but if they do, someone will have to remember to update the script.