I want to use a theme switcher plugin, combined with widgets, to enable a) my readers to choose a theme they like, and b) each theme to have a different arrangement of widgets in the sidebar(s). I have experimented with both 2.2 and 2.1.3+plugin, making sure to name the sidebars explicitly and uniquely and to call them in the function by the unique names, and it seems this isn't possible. Am I doing something wrong or is it just not possible after all?
I would prefer to not hack core wordpress files, but any helpful plugins would be useful to know about.