I would like the same, or something similar.
Have you considered an MPG (manual pulse generator)?
I would also like to create a full-function jog pendant that has similar features to a standard, commercial machine but I don't really have all the knowledge to do so yet. I am slowly digging into it and I will build something one of these days once I figure out exactly what I want. I think a lot of people would like to see such a thing and I see a few out there, but I haven't found any I care to purchase.