How can we improve WHMCS?

Allow clients to change billing cycle
Lots of out clients sign up for monthly billing cycle and they request to change it quarterly o annually after the second or third invoice. It would save a lot of stuff time if clients have a feature to change themselves the billing cycle for each product or service.

Allow clients to change billing cycle
Client needs to be able to change their billing cycle from client area

Allow customers to change his own billing cycle
We have a lot of requests, where customers would change the billing cycle. Some customers do this more than one times a year.Think about an option on clientareaproductdetails to let customer change his billing cycles, whenever they want based on product settings.