Sending messages of any kind via OSC, by using the possibility of text items (or empty items) in the arranger would be great!
I usually use an "empty" JS plugin with some automated sliders send over OSC to get my automation data to control Max/MSP. Being able to arrange OSC messages just like audio and video clips would be a total game changer!!! The OSC messages could be whole strings of messages and very customizable for a lot of different scenarios.
Looking for this option I now played around with the menu type slider available for JSPlugins to send those menu entries via OSC. It works, but it's impossible to use "," as part of the message, because it is reserved for nothing else in the JS language and also, it is not at all as convenient and neatly as it could be using notes from an empty item.
I posted a feature request here:
https://forum.cockos.com/showthread.php?t=216355