Is there a way to select different outbound and inbound flights? Now it seems that only certain pairs (in/out) of flights are offered. I need to select a certain in and out for later this month.

Also, what are the differences between the 345 & 777 in regards to Econ. Seats, Entertainment, Food, Service, etc?

Last question: Can I earn miles to any Star Airline. I thought that I can earn United Miles for Emirates flights. True?