Symphony.

We have a slideshow in a project that is showing images provided by a Symphony section. This slideshow has a play mode which can either be "slide automatically" or "slide on click". We'd like to add a setting to toggle this mode: something like a simple checkbox an author can click in the section index.

Does anyone know an extension that handles this kind of custom per section settings?
(It really should be in the section, because authors cannot and shouldn't access the general preferences.)

I don't think there is such a thing. You could make a static section that is just a bunch of checkboxes.