retegrity Let me just confirm if the issue is what I remember... Actually no, there isn't an issue at all.
You said Tunneller stops regardless of what Freecam settings you use. That's not true. When Freecam's "Apply input to" is set to "Player", Tunneller keeps going.
It only stops when "Apply input to" is set to "Camera", which makes sense. You wouldn't want Tunneller moving your Freecam camera instead of moving the player. Plus, since I recommend setting a keybind for the "Apply input to" setting anyways, that doubles as a nice play/pause button for Tunneller while you're in Freecam.
I thought I remembered running into some weird edge case with Tunneller specifically that made it move the camera in both modes, but no, it behaves exactly like other hacks that make the player walk/fly automatically. Camera mode stops movement, Player mode keeps it going.