I have this implemented in v1.3. I couldn't place it where it is in the SS as it would break compatibility with XF 2.1 due to a change in 2.2. Also I only used one option for both moderate replies and threads, as an option for each didn't make much sense to me. 0 is always moderate threads and replies, and a value of 1 to 28 represents days. I limited it to 28 days since registration, as it felt like a nice round value to use as a max days that have passed.