Make weight painting stick to surface

This probably has been asked before but I can’t seem to find it and neither will google. I have been looking for an option that will make the weight painting stick to the surface I started painting, for example, I’m painting a finger and suddenly the torso, the arm and the other fingers have weight too… and it’s really annoying having to be rotating the camera for every stroke. There’s an option for this, right?

So… there isn’t?
Seriously there is no option for this? Even the cruel Maya has it :c