Thanks for finding the thread. There are certainly times I wished I had a position control in the rear, now I have some ideas for a future project. The adjustable links save a lot of time.
A couple time I taped quarter round wood molding strips to the lever controlling the 3-point. Run the wood strip out back just past the side of the seat. It kind of works but its also somewhat harkey-farkey. Requires that the tractor be running while I'm making the connection - I don't like that situation at all.