I agree it's an inconvenience but really, you get what you pay for. This is a very good product but it's free so you pretty much have to accept the limitations that the developer is not willing to address.
In the case, it runs as a service, services are not meant to be turned off or on by switch preferences. it doesn't seem too unreasonable to just disable the service and re-enable it when needed...
But this is just my opinion.