1. RJ in business class is truly excellent. You won't be disappointed.
2. Lounge at AMM is interesting, but entirely adequate. Snacks, comfy sofas, pcs with internet, lots of men with moustaches and exceptionally scary toilets.
3. LHR-AMM is 120 TPs, AMM-MCP is 40 TPs, so 320 TPs for the return trip. The miles won't post automatically, you'll be chasing them afterwards but with persistance will get them eventually.

A search for threads with Royal Jordanian in the titled reveals:
http://www.flyertalk.com/forum/showt...ordanian+royal