There was a "test game" feature in the beta version that essentially did this. I think most want it, but for some reason WIS did not include it in 3.0 and has not addressed it since.
It would be a HUGE benefit to all coaches, and I agree, it would really help new coaches figure out formations and player positioning.
These are the kinds of things that could be implemented across all levels, that would benefit newbies and veterans alike.