Currently the option to repeat weekly cuts off at 12 weeks. It would be nice to be able to repeat a task every 13 weeks which is exactly a quarter of a year (52 weeks/4).
This would be a much cleaner option than trying to repeat every 3 months which can make the start/end dates begin on an unknown day of the week. Repeating every 13 weeks would ensure the start/end dates are always on the same day of the week.