The transporter role (trans) is the singular most functionally broken role in the entire game. I will discuss the reasons behind and the potential fix of the ill behaved role.
First and foremost, we will explore the role of trans and what it brings to the game. Trans may swap the location of two targets every night, if one is visited by mafia, the spy will will display the swapped target.
On the one hand, for town, this is incredibly disastrous for town to correct their will, especially for spies. Town will need to spend an excessive amount of time to correct their will and others' will - provided the transporter reveals (which may be tactically horrible to reveal). If transporter does not reveal, then wills will likely render a town member suspicious, or rather a mafia innocent.
On the flip side, for the mafia and NE, it is entirely possible for the transporter to make them kill themselves. This is not the problem. However, the problem is that a game can have so much undecided variations in early game (ie N1-N3) with this. It is strictly un-tactical to swap two people on N1, though in one game maf kills maf, and in another game, it completely destroys town wills. The uncontrollability of what this role brings is the problem.
In addition for the mafia, when it comes to middle and end game, transporter completely voids strategic decision making. Without trans, mafia may target key player and strategically eliminate players. Trans voids that completely and mafia would need to randomly hit players in order to strike their desired target. It is completely broken and renders the mafia brainless in this setting.
The problem is heavily exacerbated when there are more transporters, imagine 4 transporters and the entire discussion during day would be to correct wills (provided all reveal). Mafias would almost never strategically hit their target, town would have no room for constructive discussion.
The argument is, this role should not exist in the first place, it is not beneficial for town, nor the mafia, neither can it be a NE - though it is a town role.
My suggestion for the fix would be along the lines of giving trans a cap of how many swaps they can preform, hopefully only 2 (MAX) as well as setting trans as a unique role. Or completely removing this game destroying role.