Ban any HUD, any calculator, datamining for hand review can stay.
Limit multitabling to 4.
Limit sitouts to one 5 minute sitout per hour and to two 2 people sitting out at the same time at 1 table.
80bb minimum buy-in for all cash games.
No hide from search option, no name changes, no avatar changes.
holdem variant, special no limit - self CAP game. At any point in hand you cap your betting at a certain value. E.g. you have 200 stack, but you bet 20 preflop and "cap" it - that would treat you as "all-in" for that 20 and you wouldn't be allowed any more bets, same option to cap it on any street you want. This could really damage fish IMO. Maybe not... it would be an interesting experiment.