[Bobby]

If you're playing with a no zone rule, also liberalise the penalty slightly for a zone defense by using an NBA-style illegal defense (no zone in the restricted area when player is not guarding anyone) technical foul -- one free throw and the ball, and it cannot be used for an ejection.

Let the ejections be for serious unsportsmanlike conduct -- not for simple procedural mistakes which are not unsportsmanlike, such as illegal defense or delay of game.