I have personally done some stuff with TouchOSC integrated with Muse. It is a useful tool for a Dashboard of what’s going on in your custom application. However I will caution that TouchOSC does not work well with receiving inputs and sending outputs as a result. It operates as a useful UI for updating, but as far as I could tell it does not allow any kind of OSC reactions.
In my application I wrote a TouchOSC UI that would allow the user to see the current state of another application I was using with Muse. I could then send commands from TouchOSC to my application through Muse-Lab, so I could see the messages, to initiate tasks.
It’s definitely a useful rapid prototype tool. Limitation is it won’t allow reaction based messages to cause a response to a message. Works well for an experience feedback and UI though.
You may find it useful to have an additional application running that will handle reaction controls in Processing or Python.