Unfortunately there is NO WAY to change these settings later in the process. The midi devices are a great idea, but the implementation sucks. Just an example: you cannot use note on note off values to control a midi device, the editor does not allow it. …
The midi devices - I followed its evolution quite closely - was an idea- a feature implemented (as I assumed by a 12 year old junior-programmer…;o)… and since it was not in use NOT developed further - instead of that they provided a dedicated documentation how to handle the rubish-editor.
Sorry to have no better news for you.