The nice thing about FedEx is the are so many different choices in your monthly schedule that almost everyone wins (commuters and local). Now, of course, most of it all depends on your seniority.
Of the 4300 pilots about 2000 live in MEM, the other 2300 are scattered all over, literally. Back to your questions...a majority of the trips start and finish out of MEM but about 1/3 of the lines start elsewhere so the company buys you a positive space ticket to/from that city. MEM is the "Super Hub" but we also have "Mini-Hubs" in OAK, IND, EWR, and AFW. So if your route does "hub turns" threw a city other than MEM more than likely you will have a paid ticket to and from work.
Example...say you get the COS-OAK-LAS-COS week of flying and you are MEM based. The company buys you a ticket from MEM to COS Monday morning and has a return ticket COS-MEM Saturday afternoon. But you don't live in MEM, say you live in Dallas. You cancel the ticket the company bought you and however much the ticket cost you get to use to buy a ticket from Dallas to Colorado Springs.
As far as Subic goes, it is a really small base...@40 CPT and FO's. Subic base basically disputes throught Asia what the MD11 brings over from the US and they have there own Asian package sort. There are some (half) that actually commute to the Philippeans (ouch!) If awarded an Airbus seat in SFS there really isn't a seat lock per say BUT the company will pay for your move over there (@$10k+) If you move back within 1 1/2 yr you owe the comapany nothing and if you stay over there for at least 3 yrs the company will actually pay to move you back home. If you move back early there is a prorated % depending how long you where there. The pay is the same for a wide body pilot not matter where you are based (ANC, SFS, LAX, MEM).
Hope this helps.