I don't think they would include any Switch specific specials features like that.I was thinking earlier, something cool that RetroArch needs is the ability to have two config presets that maybe you can assign to docked and handheld mode.
So for example, you might have a config preset that uses a 720p resolution, JoyCons for input, etc, which you set as the "handheld preset". And then you can have a 2nd preset that it seamlessly switches to when you dock the device, that maybe uses 1080p res, possibly a scanline shader, and maybe the Pro Controller as the input.
However you could have all cores two times on your SD (Snes9x_handeld.nro + Snes9x_docked.nro for example) and save some adjustments "per core" for those.