I am not defending Forshaw or any other coach who does it BUT I think the rule is that after a substitution a "coach " is allowed on for 3 minutes to re-organise the positions etc. Having said that if you are allowed 3 mins for each sub and you are allowed 12 interchanges then they would be allowed on for 36 mins of the game. Total farce but all clubs do it.
Also if a team cannot re-organise after a substitution then they should get a new captain.

the last time i saw the regulations on who's allowed onto the pitch and when, it stated that once the sub has been made the trainer must leave the field of play. but i have been out of the rfl for a while now so it might have changed.

Actually it did us more favours in the second half as his directions confued the Pies, perhaps he still thought he was still "Running with Bulls"
I have never noticed it have a positive effect when a trainer/water boy comes on barking orders it just confuses their own team and incense the opposition fans! Refs are allowed to red card them if they do overdo it, I'm sure that happend to Ming at least once!

Also in the vast majority of games most of the the substitutions are pre-planned so who's going where should have been worked out before game begins.

I dont think they are allowed 3 mins to re-organise the team - I seem to recall they are allowed to be on there for 3 plays of the ball - I also remember Castlefords water carrier being announced over the tanoy as the man of the match a few seasons ago