For sure BEags,
I don't want to have to pore over the receiver ODM and work out their burn from the exit point to their destination myself. I want the system to calculate back from overhead destination to the exit point and tell me how much fuel the receivers need at the exit point.
The answer to the trail conundrum lies in how much fuel the receivers need at the AAR exit point and how to get them there. If I have to tell the MPS the receiver exit point fuel myself then it's not an MPS, it's a calculator.