In SMAX, on the history tab, the Updated By column uses the Label and not the ID of the person who updated the record. However, in the Details section, the person's ID is used instead. I think the Label (name) should be used for both. Less important, but also helpful, would be for the Assignment Group to use its label.
Bonus points if the same could be done with the User Options detail. As it stands, it is just code which doesn't provide much information to the person looking at the history record.