Android could let me add a specific source so I don't have all-or-nothing security. For example, I only wish to install apps from HumbleBundle and F-Droid (in

Android could let me add a specific source so I don't have all-or-nothing security. For example, I only wish to install apps from HumbleBundle and F-Droid (in addition to the default play store). Any other APK that lands on my system is still untrustworthy. Of course, this would probably require additional signature on the APK, since I think all 3rd party sources are just providing raw APKs.