Toggle panning behavior in orbit control

[karimi]

I like to add a lookAround behavior to the standard orbitcontrols. In this mode, camera stays in its position and only target moves. It can be seen in this example when you hold down shift and drag:
http://rawcdn.githack.com/sciecode/three.js/dccf1578343bb9b7c79bb2eb2004d5ee34a76e6a/examples/webgl_loader_gltf.html
I wonder if something like that can be done without modifying orbitcontrols. In addition in the example above this behavior replaces default panning behavior of orbitcontrols. I like to keep both and maybe assign different keys for activating each (like Shift+drag for panning and Cmd+Shift+drag for Looking around) .
I thought of doing something with useFrame to lock the position of camera to what it was and only applying changes to the target but I think it's an overkill and there should be a simpler way of doing this