Right now I have a roundtrip award booked DFW-DPS using my MP miles. This is my first MP ticket and I'm trying to get a ruling on my chances of changing it to something that I don't think techincally allowed. I was able to get one of the SQ F awards a few weeks back and I'm booked DFW-SFO-HKG-BKK-DPS on the outbound and DPS-BKK(3 day stopover)-HKG-SFO-IAH-DFW on the return. The return is less than desirable because it involves a 4 hour layover in SFO followed by a redeye in domestic F on United, a two hour layover in IAH then a regional jet from IAH-DFW. I'm sure the 12 hours from HKG-SFO will be bliss, but the 10 hours that follows to get me back to DFW won't be. My preferred routing home after the stopover in BKK would be BKK-FRA-DFW. There are midnight flights on TG and LH that would get me into FRA around 7:00am with a 10:00am direct flight from FRA-DFW. Total travel time would be about the same, but I'd get to spend a few hours in the FCT at Frankfurt and get a direct flight from FRA-DFW to finish the trip. I know it's the old F product, but that would beat the 10 hours I'd spend in layovers and domestic F. The questions (I'm *A Gold through a status match if that matters) I know I'd need to make a return change BEFORE I took the DPS-BKK return leg. I do that 3 days before my scheduled BKK-DFW return. Can I change my return to a TATL after I've departed given that my outbound was a TPAC? Is this a grey area that some agents allow/overlook or is this a hard and fast rule?