I know you are currently working on rotations and player positions at the moment and you also have the Ruck and 2nd Ruck selections.
You could also add a Depth Chart for each player position on the team.
They are common for NFL teams.eg.
So for AFL you could list each position and then choose 3 or 4 players and the priority to play the position.
You could add a Depth Chart screen into Team Management somewhere for this.
So if I was playing as Melbourne I could select Max Gawn no.1 ruck, then Braydon Pruess no.2 and Luke Jackson no.3 ruck.
This means these 3 players have priority to be selected in the ruck position on game day.