Ok so the three modes we want to have access to are

Position Mode: YMINUS, XMINUS (no slit, no grating)
View Slit Mode: YPLUS, XMINUS (slit, no grating)
Take Spectrum Mode: YPLUS, XPLUS (slit, grating)

In principle, "Position Mode" should include some kind of repeated image-taking, like a "focus" mode, but I think that's easy to have enabled anyway.

So is this something you could easily add, or something I should try to develop myself?

I very much appreciate your attention to this, by the way.

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