Ed?Is Dim. (read it backwards!)
This is two plugins, one to convert to mid/side and the other to convert back. Put ANY OTHER plugin between them. Try Pressure, or Density! Using a saturator such as Density means that the mid channel will distort a lot quicker, boosting the side information. You can do striking things with the spatial behavior of a stereo track using this, and you don’t have to be using stereo plugins for it to work (both Pressure and Density will run dual-mono but that works fine!)
Match the trim settings (defaults to direct conversion) or adjust them to tweak mid/side levels. Run a whole mid/side buss if you like. This utility makes for a great building block that DAW manufacturers forgot!