Can anyone tell me why the thick back rebate option appears to be hard locked to a tenon depth of 6.5mm. I want 9mm half the thickness of a 18mm board. This will help me in other areas, but every time i adjust the paramters to do with back boards and rebates etc, they get demolished and just turn a thick back with no rebate and machining. 2 screenshots, one is a 6,5mm tenon one is set to 9mm.