unfortunately there is no way to do this AFAIK - i wish there would be a trigger to catch the event. i would add a feature request to support iOS events like home button pressed or auto-lock activation ..
You can try it, but I doubt you'll get anywhere. Apple's guidelines for iOS apps pretty much stipulate that apps should pause when the device is put to sleep. This has been discussed before.
the problem is that when FMGo get's closed with Home-Button, FMPro doesn't reset the connection. Close FMPro then requires a Force-Quit.
Feature request: A scriptfunction to reset all shared connections with FMPro.