Bimonthly option for auto scheduling

hi
we currently have only weekly, biweekly and monthly appointments. can we add a bimonthly option too? or a custom length eg every 12 weeks/3 months? i use for my dog grooming business and bimonthly (8 weeks) and 6 - 12 weeks is a common timeframe for rescheduling. please intergrate as manu clients have been asking for this option.