Prevent starting when not enough players

[Pistolero]

Suppose a game where 3 players is the minimum to play.

I state I want between 5 and 6 players only

When there are 4 players, it's still possible to start the game. It happens sometimes when the 5th player leaves the table at the same time I press the start button.

I think it would be nice to restrict game launch when the number of player condition is not fullfilled.