I thought about a touchscreen, but my hatred for touchscreen phones is tough to get over......I miss my blackberry with a physical keyboard.
A simple small pendant with an mpg wheel, resolution encoder, feedhold, cyclesmash, and e-stop would be fine. I do like the stock one that comes with the tormach a little bit, but I miss the cyclestart, and feedhold buttons. I don't know what you call the mpg on the stock one with the return to center twist, but I like that for general movement, but for manual milling prefer the job wheel. The last generation haas machines have that type of mpg wheel, but they also have screens with a lot of other options I never use on them.
One day when I catch up on projects I'd like to have a go at making one, as a learning experience. But it's not a huge priority at the moment.