I have decided on MRU as it is a lot cheaper than I thought, only 1500 in Club and 1100 in Premium Economy from LHR.

So you're saying I should go like this:

MRU-LHR-AUH-MCT-AUH-LHR-MIA-JFK-YVR-DFW-LAS//LAX-ORD-HNL-SYD (read below for Australia) SYD-JNB-MRU

1) Australia - According to the oneworld validator tool I can do SYD-PER-MEL-AKL-SYD, what is wrong with that. If it needs changing then do I change to SYD-PER-CNB-MEL-AKL-SYD

2) On the AUH-MCT-AUH leg, do I earn the full 360 as it is a freedom flight or are there seperate rules for AONE* fares.

3) Stupid question, but on the US legs can I stop for a few days in each city?

4) Just to confuse matters, if I miss out Europe and have Asia as my other continent (in addition to S.Pacific, Africa and N.America) is that doable, what would be a good route maximising the experience and earning potential (I hear CX product is amazing)

5) I will be moving to Europe so the earning threshold will be lower. When I earn Gold on BA, what is the next best FF to join.

Thanks in advance.