New Call Speed Option Suggestion

Whenever I'm playing this and I'm about to go to sleep, I'd put the call speed to extra slow so I can clear all the calls then go to sleep. Though once in a while I'll get stuck with a call that will have patients or prisoners that will be needed to be transported which takes a bit and sometimes takes long enough for another call to pop up. So I thought it would be a good idea to have an option to have like an off button for call speed. What it will do is disable your call system and no new calls will be generated until you select a different speed.