saviboy
An ICAO recognised licence is acceptable. When being employed by MK you are issued a Mauritian licence on the grounds of your existing licence, in your case an FAA one.
Heathrow09L
MFF (multi fleet flying) on A319 and A340 is only done by a few of the more senior pilots at the moment. Normally (exceptions do occur) type rated pilots are placed onto the A340, B767 fleet.
A319 is now generally being used as a progression to the A340. Some ATR captains have progressed onto the A319 as FO's recently, and so have some FO's from the A340. These will soon be receiving their command training on the A319 in time for the delivery of the second A319 in Q1/Q2 of 2003.
Entry level for lesser experienced FO's would most likely be the ATR. The offer of employment is made for a specific type, from there one fits into the company policy as determined from time to time according to the company's needs.
Hope this helps.