@baskerville: Have to run out, will test later tonight
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Random remark in the meantime: Nickel's default mapping is with the *bottom* button bound to next page, with dynamic mapping according to the rotation for it to keep following the same logic (i.e., top becomes next pg @ CW because it's then on the right, which makes sense, at least for LTR scripts. That's the default default mapping, but there's an option to invert it.