Do you mean having a player individually play aproximately in those minute ranges? That could work. I was think in a system that would divide aproximatly the 48 minute of the game by the 2 ou 3 players that we designate for each postition. But i guess you're idea is good too.
Better yet, if it was possibly to introduce both options, users would have a bigger span (and more realistic) of coaching decisions.
That woul be extraordinary.