I can understand if an FRMS prescribed what types of 'duties' can be undertaken prior to an ULH flight. I can understand the requirement for 24 hours off between duties. IE pax to SYD for EPs in Sydney on Tuesday, do them Wednesday, pax back to PER that Wednesday evening and then sign on for LHR on Thursday evening. That looks a little nuts to me and a restriction makes sense for that sort of case.
How I choose get to work though is realistically none of the FRMS' business unless it's going to put that sort of restriction on all crew- and I just can't see that happening. I recall one of our very, very fit 767 F/Os often running to work from the Northern beaches even for an 0500 sign on. He's a sharp operator and I never found him even a little tired for the tour of duty- though it was unusual to get him to come out to dinner beyond about 2000- but I wonder how the FRMS would view his 0200 wake up and 25km run for that?