A friend is interested in buying an RTW ticket on AA codes in economy or perhaps business if that is cheap starting from the cheapest point (which as I understand it, is CAI).

She wants to visit CPT and Maritius on separate occasions, and has reasons to go to Israel (TLV) and the USA (JFK, BOS) during the year of validity.

Is it possible to book an RTW ticket which would allow for some long stopovers (ie several weeeks/months) in LHR to separate the trips?

ie. the desired itinerary would really be something like
LHR-CPT-LHR-Maritius-LHR-TLV-LHR-JFK-LHR-BOS-LHR

Alternatively, if such stopovers are impossible, would it be possible to stopover in a city within striking distance of LHR (eg BRU, PAR) instead for some of the stopovers and then buy a cheap ticket on another airline or even a Eurostar to return to LON?

Finally, is it possible to get the flights as AA codeshares since that earns the most AA miles? A BA coded RTW ticket (especially in coach) is much less attractice because of their 25% meanness.

Thanks.