Great post, Craig, but I admit to a pang of jealousy. I’m cutting a 60 minute Culture Show special in Glasgow right now on Avid; I never dreamed that doing so on FCPX would be possible. Jealous, but glad the tide (tilde) is turning, as you say.
I did manage to cut four 60 minute music shows for BBC about a year ago (I pounced when multicam and broadcast monitoring appeared), but I was working at a facility where I had a modicum of clout —it was an indie rather than the BBC itself.
Anyway, I cut those to 59 minutes to the frame in FCPX just fine. Like you, I’d never imagined that there could be an issue here.
So, as one who finds FCPX a delight, glad that I might soon get to work with it more often.