I have been playing with WAG for an hour or so and am very impressed by the simplicity and effectiveness. My compliments.
My suggestions would be
1) Optional Step in album creation to add a Server Side Include or some other code in either a new DIV or the Navigation DIV, allowing for customized menu and navigation tree without having to hand edit all generated pages.
2) Seperation of thumbnails and full photos into sub directories, as main directory gets very crowded in large albums.
2) Provide a "Use Default" or "Use Custom CSS" option in albun generation. Not a large deal to use the import command that you suggest, but it would just remove the manual step having to go in and edit multiple HTML pages.
That being said. It is still an excellent program, and my donation will be on its way shortly. If a paid version including some advanced options comes out, I will be happy purchase.