If I remember correctly, enabling autoboot disables manual boot. In that case, a person can just stall each turn for the max boot time.
Had to check and you are right, that feature was indeed removed. But games still support different auto- and direct boot times, so i m sure there must be some way to create such games, even if the option is now missing.
For example you can click "rematch" on an old game that used different auto and direct boot times to now host a game with the same settings.
Talking about removed features: there used to be an account setting page with more settings - anyone knows if thats still accessible somehow?