THANK YOU pandaperth!
Again, thank you all so much. The information you are all providing is invaluable. I am going to try to lock this in this weekend. I am just hoping AA's RTW desk is open on weekends.
I have a solid idea of where I want to go and when I would take my first two flights. If I am understanding what I have read and what you all are telling me, the dates of the flights that follow can be changed. When I use the online planner, the calendar only opens up to June 2017. Is that a restriction with the planner only or will I have the same problem when I call AA?
I have been up since the crack of dawn trying to put something together. I would appreciate any input and any help on a couple of hitches I have run into. I'm also going to try to use this fancy new lingo I have been learning.

<--- and emojis.
I want to book and ex-MPM DONE4:
MPM-xDOH-SIN-(Surface Sector SIN-DPS)-DPS-HKG-MNL-HKG-LAX-MAD-VIE-HEL-CDG-DOH-SEZ-DOH-JNB
The problem I am running into is SEZ-DOH-JNB at the end. A message pops up that says "100: You may have only one intercontinental departure and arrival in each continent. Change your route or your flight choice."
If I were to travel to SEZ via somewhere other than DOH, do you think that would help?