With the Shooter mode coming, it was only a matter of days before players started to "exploit" the mini character in order to be harder to target via mouse pointer.
In my book, this fits perfectly with all the other dirty tactics like "Security Escort III" some players are willing to go for in order to get any tiny bit of advantage they can. They do not blatantly "cheat" but they want to confuse you. They do not believe in fairplay, only in victory by any means.
Staying in RPG mode and tab-targeting-lock on target defeats mini-character just fine thought.
Edit: This of course will have for consequences, like in most other mmos, for devs to adjust Min and Max size a character can be in order to promote fair PvP which will end, like it always does, affecting players who do not PvP or ever intended to "cheat" the system.