Reminder frequency could be set on weekly or monthly basis also.

[fsmangolini]

So that if I have a habit to be done once or twice a month, I could set an alarm to remind me just then, not every day or week...

[sanjayvsingh]

This would be helpful. For example, I have a "Donate to charity" habit set up with a custom period to "Repeat 2 times in 30 days." It would be nice to have this set up to repeat "Every month."