I want the holds and the "momentary" performance functionality to be able to activate Bass Inversion in real time during a song. (This allows me to play that odd "slash chord" when the rest of the song consists of basic chords.) The other "momentary" performance will temporarily change the Arranger Type (e.g., chord recognition mode) from "Intelligent" to "Standard." This will allow me to play occasional open fifths, 7ths with no 3rd, etc., while still using Intelligent mode for the majority of the song.

In the books I've been playing from, "open" chords are pretty rare (except for Sus2 and Sus4 which are already recognized in Intelligent mode.) But I'm also thinking about your "trick" with the chord sequencer and the NTA.

Casio seized upon Roland's missed opportunity here... Casio "Fingered 1" mode is very similar to Roland's Intelligent mode. However- on the Casio, if you play [1+5] you get an open Fifth. On the Roland, playing [1+5] triggers a Major chord, which is really dumb, since you could already get a Major chord by playing only the root, or 1+3+5. What a shame we can't hack the OS and make small changes to things like this! I would probably be investing my setup time in a Casio MZ-X500, except that the MIDI implementation on that board is half-baked, and the keybed is rubbish!