I thought that T/S lenses rotated to allow you to tilt in all directions, and Narikin is talking about shift only, so it might be possible (subject to weight/strength restrictions) to mount a tripod adaptor on a jubilee clip or a filter ring.
Dick, a T/S barrel rotates to allow changing the direction of both tilt and shift. The same applies to lenses that can only shift (old Nikon F, Olympus OM, Mamiya and Pentax 67). Else you would only be able to shift in only one direction (i.e. only rise and fall, no horizontal shifts, or vice-versa). To get both, you have to rotate the barrel to a diagonal position. I haven't seen a lens that provides independent X and Y-axis shift knobs.
The Mamiya 645 50mm F/4 Shift uses a ring to determine de rotation angle. A tripod collar can only be fitted near the outer barrel, at the end of the lens (not ideal, as you might have stability problems). The rest of the space is occupied by the focusing and aperture rings, and shift knob. Even it the collar could be fitted, you'd have to first compose the scene, then mount the collar to the lens ... hardly practical. If you mount the collar first, any rotation of the barrel would throw the camera off a perpendicular position (you'll have crooked horizons). This is only practical if you only do rise-fall along one axis, leaving the rotate-barrel ring alone.
I'm not sure if I was successful at explaining this, but one only has to pickup a camera and lens to see these limitations.
Pedro