Another solution is to purchase a oneforall or radio shack universal remote. These remotes can be programmed with advanced codes that usually include all of the discrete commands. The remotes are <$20 and worthwhile. I've had one for years.

Your other option is to just a use a macro as a workaround. Assuming you have some of the discrete codes for other inputs as well as a button that scrolls through all of the inputs....if so you just create a macro that sets the input to a known selection (like video 1) and then includes one press of the "scroll input" button to make it change to video 2 (assuming that is the order it scrolls in).