If one could close a plugin by clicking on the plug in the FX bin, that would save quite a bit of time across a day's work... esp with 2 x 23" screens. That's a distance to travel!

If you use the Plugin Recycle setting in Preferences>VST then only the most recently is ever open. I've found that saves having a heap of plugins open across the screen.. If you ever need to over ride then just ctrl+click the plugin. I know it's not exactly what you want but it's a way to make your workflow more streamlined.