Audit Record Purge Criteria does not line up with schedule options.

Seems to be lack of user involvement. When you setup a Audit Log Purge Schedule task, you can pick options for what to keep. Typically, if you are purging, you want to get rid of older records, keeping only items within some time period. The criteria and frequency should align. For example, what is the point of running a purge of last year with a frequency of every two weeks? 

Aside from manual dates run on a one-time schedule, the only ones that make sense would be to purge last year on a yearly schedule or Last month on a monthly schedule. No option if I want to keep last 3 months which would align with a quarterly schedule. Has anyone looked into modifying the Duration drop down for add more options?