Suggestion - Variable Chance. hidden percentage.
adding a variable chance percentage to the chance options and hide chance percentage.
I think it would be a nice idea to have the chance function allow variable chances. this way when setting up a session, the wearer can choose I.E min chance 10% max chance 30% and allow emlalock to set a random variable.
Likewise the addition of hidden chance percentage would be good for increased frustration as you will not know what the chance is. this option could be toggled on or off when setting up the session.