I am just wondering why DEVs says that it isn't -possible- to change. Not technically possible? Cannot be true as we all know that certain tools allow players to perform a such thing. If something can be performed by a third party tool, how come it cannot be implemented natively?

I am not encouraging anyone to use third party tools don't get me wrong. That's a violation and can get you banned.

Yet I have a hard time accepting such an answer : "not possible". I wouldn't mind if DEVs were saying "We want players to re-acquire their target manually everytime". But saying that is isn't possible is like saying that Final Fantasy XI will never be playable in Windowed mode on PC...