At present the thumbnails and thumbnail stacks in the extras tab apply to the whole tour. A good extra would be to have the option to apply a thumbnail/stack to a single panorama.
Someone asked me for a tour showing various places at different stages of development. The above idea would make this possible.

Project properties --> Extra. Here you can choose thumnail, stack, list and some.
http://360impressions.de/WuppertalPad/
http://360impressions.de/K21Pad/

best, Klaus

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Simplicity is the keynote of all true elegance. Coco Chanel

I think this can be achieved via the PTO GUI with V2.x.

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Andrew Stephens
Nikon D40, Nikkor 10.5mm fisheye, Sigma 8mm f3.5 fisheye, Nikkor 18-55/50/35mm lenses, Nodal Ninja 5 Lite, Nodal Ninja 4 with R-D16, Agno's MrotatorTCS short.
Nikon P5100, CP5000, CP995, FC-E8, WC-E63,WC-E68, TC-E2, Kaidan Kiwi 995, Bophoto pano bracket, Agno's MrotatorA.
Merlin/Orion robotic pano head + Papywizard on Nokia 770/N800/N810 and Windows 8/XP/2K.

Sorry - i misunderstood your question in the first run . .

You can deactivate the visibility of the stacked thumbs - or any kind of thumbs - by editing it in the exml.
So you can select where you want to have it and where not.

And you can changed that anytime back.

best, Klaus

_________________
Simplicity is the keynote of all true elegance. Coco Chanel