But there very well may be military action in Philippines, Malaysia or Indonesia regions concerning Al Qaeda related factions.
Harriers are V/STOL aircraft. They have the ability to make a normal, albeit short, take off roll. There are a number of Argentinian pilots, 20 confirmed and 3 probable, who can personally attest to the Harrier's capabilities as a dogfighter. It's ability to VIFF, vector in forward flight, gives it an agility matched by few fighters. History has shown that most dogfighting occurs at Mach 0.8 and below.
British Harriers can carry the AMRAAM and ASRAAM in addition to the Sidewinder. Marine Corps Harriers can carry the Sidewinder and some have been upgraded to carry the APG-65. Depending on what version they lease, the Taiwanese could have a very capable fighter.
Because China will tip off an attack by missile first in order to eliminate airports and runways. Harriers do not require runways since they have verticle takeoff ability. Once airborne the harriers can provide defense until jet fighters are capable of launching.
Not the way mainland Chinese fly... remember how Beijing claims our EP-3 rammed Wong Wei's fighter? ROTFLMAO! Beijing should be grateful we didn't sell Taiwan something with propellers.