GPI or OSC trigger rundown


I would like to use the Caspar client (2.0.8) to build a rundown and trigger this rundown by automation to use CasparCG as playout in a multicamera setup.

I know there is a built-in GPI option which covers most of the triggers I need (play/stop/pause). It seems however not possible to step up (or down) in a rundown? Does anyone know if this is possible or does someone use a sort of workaround. Maybe it's possible to simulate a key-press on the up or down key but I don't think this is a reliable way of using the rundown.

Hope someone already did the trick.