My outfit has the paperwork set to the first mov ement under own power as well. However, the company still us asks to review the MEL and contact the OPS and maintenance squads before departure (single hub operations here) to decide, return capability being a factor.
Further more, all of us know that 737 NNC says that EQPT Cooling OFF thou shall select the alternate fan, and if that fails as well, well ... no crew action required. Ha, ha. On the other hand, the MEL admis that single fan dispatch is still possible but on the very contrary to the QRH, should the single working fan fail, in 90 minutes one may face "loss of essential flight instruments".
Our flights to DUB are 2:00 on averge, CAI standing at 3:15, still not speaking of the extremes that reach 4:20 on the return leg, 737 classic speakng.
Airmanship should be revealing here I guess, and luckily being just another CM2, it is not me who gets to decide...
Cheers,
FD.