1. They can use more secured ways to identify the real identity of their customer, the best thing to do here, aside from valid ID is they should add "take a selfie" on identity process.
2. They can also set a time limit of playing for a player, give notification if this would be their last game anymore for today.
3. Set a notification showing how long they've been playing.
When i got to look into your title and this point raised by you, i see a little contradiction because the casinos will not want to implement on this points above listed by you, why should they, going through this to the extent of taking ones picture is totally uncalled for considering ones privacy except if the gambler is such that wouldn't mind on these and because not this whole process, some gamblers may decided not to use such casino and look for another that does not gave such requirements as verifications.
With these kind of features, they might actually help or lessen the addiction of a gambler.
It's nobthe casino's responsibility or the government in helping a gambler to control his emotions for gambling addiction, you went there all by yourself to gambles the way you like, gambling is all about freedom and choice.