How to make packages from f-droid to be treated as from a "known source" (if I have root)?
Almost every F-Droid app is signed with a different key, though all keys are in the same key store. In order for the switch to be bypassed, F-Droid client would have to be installed as a system app and made to work safely as such. Some code has been supplied for this to work, but it hasn't been integrated yet.