I agree with bFooz and hopi about the embed FX. REAPER can show any FX parameters in the MCP/TCP, and I feel the functionality has a potential to be like a user-customisable embed FX, maybe by visually grouping the parameters by different plugins, and allowing users to color each parameter (like the image below). It works with any plugins.
Something like the EQ curve display in Pro Tools might be useful, though. It’s now supported by more third-party plugin developers.