Editing Recurring Tasks

Editing Recurring Tasks: I'd like to be able to edit recrurring tasks in a manner similar to Outlook (where the repeat pattern, etc. can be altered). I setup recurring calls so that I eventually get to speak with a candidate--Once I speak with them, I like to change the frequency of contact. Currently I have to delete up to 20 recurring events and then create a new series with the desired frequency. Initially, I try to setup 24 months of recurring calls so that I eventually connect with them--it's a long cycle in my field. Any suggestions ??