Yes it can.
No. The open jaw distance needs to be less than the shorter of the outbound or inbound.
I.e. Out: 5000 miles, In 3000 miles, open jaw distance 1999 is OK. The reason it is called an open jaw is because it looks like the upper and lower part of a mouth and the 'open' part is where the food goes in. Your suggestion looks very much like a dislocated accident.