The perspective control functions of the bellows are more or less independent of the lens you mount on it. The one caveat is image circle that the lens projects. I do not have any data on image circle for various CZ lenses (except the 35PC), but assume that they are more or less the same.
Second, the perspective control functions do not work at very little bellows extension: there is no room to allow the front standart to be swung/shifted, if the front and the rear standard are very close together.
For any given magnification (say life size = 1:1) the bellows extension is proportional to the focal length of the lens: 60 mm MacroPlanar [Rico: I trust you meant MP60, not SP60; at least I'm not familiar with a SP60] at 1:1 will require 60 mm bellows extension; a the MP100/SP100 will require 100 mm bellows extension (all at infinity focus of the lens). Accordingly, you get more freedom with perspective control with longer focal length lenses (you also get different angles of view with different lenses).
Re "tilt": Considering you mount the camera in landscape format on the bellows, the movement is lateral, and there is also lateral shift available (i.e., rotational and linear movement is in the same direction). You can turn the whole set up 90 degrees to get up-down movements; though under no circumstances can you get movements in all four directions as with a rail-type large format camera. The rear standard is fixed and the camera can be rotated 90 degrees on the rear standard.
For a given lens, working distance will be the same as when you use the helical thread on the lens. The only thing that matters is the final magnification, which determines the working distance. If you want to increase working distance, then get the longer focal length lens.
I have owned a bunch of macro lenses over the 20 years or so. I started with an OM Z50, then got the OM Z90 (also got the symmetrical OM Z80), and use a Pentax LX with AFM100 for underwater, and now have the MP100. For regular macro, I mostly (>80%) use the 100 mm range. Only when I consider perspective or foreground/background ratios (get flower head plus whole plant) then I use a 50 or even the D21 (should eventually get the 28, still building the system).
For further info, Constant's book on Macrophotography from Focal Press is IMHO the best on the market. Ray's tome (Applied Photographic Optics, now 3rd ed) also from Focal Press has a lot of info on optics and is a gem (though a tough read).
Nelson: you mention a "flexible extension tube". I used the OM auto extension tube 65-113 mm and loved it with the OM Z80. Is there something similar for CZ? Or did you use "flexible extension tube" as an alternative descriptor for a bellows system?
Hope that helps. Daniel