Custom ring back time settings needed in Admin portal.

We would like the ability to set our ring back to receptionist at a lower interval. It is currently hard coded to 5 minutes, and we lose calls due to the long wait time. If we had the ability to set it lower, it would greatly help our business during peak times. The soft key (Private) park works but RC says they cannot make the Public Park settings match. This causes users many extra steps to accomplish what should be a simple task.