Just for fun, I punched these in on 1 of our TD-H3s. So, this isn't a feature exclusive to expensive radios. Tho I did notice you had to do Rx first before Tx. First time I tried it, I set the Tx first then the Rx, which changed the Tx to match the Rx.
If I set the Rx first, then the Tx, both stayed where I wanted them. So, order of operation might matter on your radio as well.