It's that when I'm in some locations, I don't want it to be making any form of connection out, or listening for incoming ones.
Especially in an instance where I'm tethered to a mobile device - this then eats into mobile data allowances, needlessly. Hence wanting a way to completely disable the service without having to delve so much under the hood of the OS.
At the same time, I don't really want to have to have different firewall profiles for different connection mechanisms, as by and large I trust the applications I run. Synergy is one of the few that runs as a service that m