That makes sense, basically what I was implying was a military pilot with 750TT and 50ME can potentially get hired by an airline because they meet the minimum requirements set forth by the FAA, but not those applying to meet the regular requirements set forth by the airline for those who are not military/prior or have lower requirements for age, time, and certain degrees. It is a bit of a stretch on my part, because for the most part airlines minimums seem to reflect the final rule going into effect. That is why I am bringing this up. Minimums might just be minimums regardless of having a restricted ATP via the military requirements, even though it satisfies the FAA to get into a 121 cockpit.
As far as adding .3 to a sortie, I believe you can depending on the airline, and possibly to meet their minimums. Under that pretext, I would assume it is because of the definition of flight time in section 1.1, then the resulting requirements after set forth in part 61.51 (Pilot logbooks and logging flight time).
The point being, monitor flight times separately, then combine and add if allowed by a certain airline. Corporate; no idea, I will ask around.