The recommended way of asking for help is through the community's forum.

If you require privacy, or have a more specific request, you can also send an e-mail to Camille (camille at osculator dot net).

Please follow these instructions:

1. Launch OSCulator and open the Preferences, click on the Outputs tab
2. Uncheck the “Install the Virtual Joystick kernel extension” box ;
3. Quit OSCulator ;
4. Delete the following if they exist:
   • /Applications/OSCulator.app
   • /Users/<username>/Library/Application Support/OSCulator
   • /Users/<username>/Library/Preferences/net.osculator.OSCulator.plist
   • /Users/<username>/Library/Preferences/net.osculator.OSCulator.LSSharedFileList.plist
   • /Library/Application Support/OSCulator

Short answer: you should not use them manually and therefore they are not documented.
These are internal routing arguments to handle the case of bi-directional routing with message having multiple arguments.

They are used when an OSC message with at least 2 arguments are configured with two MIDI CC. When the MIDI host replies, the received message (/midi/ccXY/Z) only have 1 argument. Therefore, in order to send the correct message back to the OSC device, we must build a OSC routing for each MIDI CC that will use and/or update the current values of the OSC device.