Wrangler with Select Trac

Since Wrangler has a option to have select trac
installed. I guess this kind of Wrangler does have a center differential and allow it to run in 4Auto
mode on road.

My original question is, if I got a wrangler with command-trac system, is it possible to add a center
differential (that can be switched between lock/unlock mode) so it then become virtually a select-trac system?