Archer,
I have a few questions regarding the classic web template:
1. Is it possible to adjust the tumb size?
Yes, there are two fields that control the width and height of the thumbs.
2. Can I customize the template so it automatically uses my logo in the header of the tumb page (above the title) and each slideshow page (above the navigation buttons)? Or perhaps a function could be added in the set-up dialoge to link to a logo file (jpg or gif) that shall be used as a header during creation?
Not unless you have some experience programming. If so, you could copy the template to your own folder and modify it as you like.
3. Can I save it as 'customized' template showing in the drop down menu?
If you're going to re-program the template then you could give it your own name.
4. I somehow made changes to the original template and saved it. Is there a way to reverse them to the original setting?
It is likely that you didn't modify the template itself, only the settings. There is no 'restore defaults' button. Though it might be a good idea to add one.
Use the snapshot button (the button in the lower-left corner with the lightning bolt on it) and you can save as many different settings as you wish.
HTH,
-Kirk