i have just downloaded this plugin and it does many things I was looking for. it is really great, thank you for that!
there is however one thing that could be useful, and that is to be able to select to show custom widgets to categories & posts in selected categories.
at the moment the widget i set up shows on category layout (for selected categories), but it doesn't show for the single post view belonging to those categories. of course i can select single posts for the widget, but in this case the widget shows on all posts, regardless of the category they belong to.