15 roster spots per season; 11 have to be assigned for the first game of the season, otherwise BB assigns them for you. And if you do not have 11 players on your roster, BB automatically signs up scrubs (similar to lucky fans) to fill the void.
What if those scrubs will be 18-year-old HOFs? It would be unfair..
Whenever you set an illegal line-up, 5 players are chosen at random from the list to play (this eliminates walkovers).
3 players is sufficient to avoid walkovers.. Eventually, it's a manager's job to prevent team from walkovers, so it not correct to my mind.
On the whole this suggestion is too complicated to come true, especially with injury reserves.
We are the ones who wanna play, always wanna go but we never wanna stay