Something I just noticed today. The solid axle leaf spring selection defaults to only spring over axle configuration. While this accurately give a really large ride height it is more common to find them in the spring under axle configuration. It would lower the ride height by 4-6 inches depending on the size of the axle housing.
Maybe as a possible solution when the slider goes above what is practical for spring under it switches to spring over. Depending on how much work it would be.
Edit: It would solve some of the crazy ride height issues with regular cars.