Bad drifters blame their drift cars..
Then buy drift cars with bigger engines to compensate for their lack of skills...
Then plow loads of money into turbo upgrades and hydro's... and still suck..
Then sell the car because there failing hard. However enjoy holding onto that 'TAKE BACK THURSDAY' of "I was a drifter
"
Such is the way of the 'UK' ..
My advice.. Learn to drift in a car that you struggle with. No reason at all the MX5 cannot be used as a great drift car, especially for learning. If you dont like it because its too small, or too girly, or not comfy enough, or not enough power.. then just stop drifting and buy a focus or something.
Regarding your questions.
Yes, Auto's can be drifted.. but why even bother when you have a manual RWD car capable already.
I dont believe its hard to swap if you know what your doing and you have cash for an R154 and all the other crap you need.. again though, why bother unless your heart is truly set on that particular car.