There are some settings in LiftRules that are not referenced anywhere. They should be removed to avoid confusion
Do you have any specific on mind ?
This for starters: https://groups.google.com/d/msg/liftweb/5eqwWO-hCko/zULEbGAW7EUJ
but should probably be a systematic effort
I've already removed all explicitly deprecated LiftRules; however, that doesn't mean all unused rules are gone. I'll try and make a pass at some point and verify that rules are being used.