I don't really understand the issue with the trainer being on. Ok he may be relaying messages but what is to stop the other team doing it if the ref is letting it go?
Rather than have a go at the team doing it, isn't it a failure of the coaching team not doing it (which Wakefield were doing too but probably not quite as much as us).
It is part of the game.
As others have identified the jeers by some fans to Wigan injuries and the reaction given by the away fans was very noticeable.
I personally found it very amusing when Gelling & Fafita went down injured and both sets of trainers came on. Initially the fans were appaplectic about 4 trainers coming on to sort Gelling, it was 2, the other 2 were with Fafita, then they were calling the Wigan pair to get off despite the Trinity pair still sorting Fafita.