I use wordpress 3.2.1 with twenty eleven theme.
I have several pages based on the template with sidebar.
Classic wordpress widgets management works as long as WP Page Widget is deactivated.
Once activated and when I do use custom widget management on those pages, old settings I tried from before deactivating appear, then disappear... it is very strange.
I really don't understand, I will try soon another wordpress install but I doubt as the one i'm currently using is quite fresh !
It is a pity because this plugin, if it works, would be awesome ;-)
Thanks anyway for your efforts till now, it shows that micro widgets management is possible and is a real need in wordpress.