Apparently it's considered hidden-ware. I guess it is because it's not a texture mod but you're switching physical files'. I mean it's not really hurting anyone else when you're in standard non-trans because range isn't affected by your parts. However when you trans -coinless- your trans will be different. What you see will be different to others and in a PvP/BvB match it could give you an unfair advantage. It's like when people would replace their lanny trans with kow in their files and it would mess with the gameplay. (People would see lanny and be hit by a insane range such of kow)
So yeah, it's pretty much hiddenware and shouldn't be done.