This isn't a criticism of the plugin, which I can see would be VERY valuable in certain design 'regimens'. But after trying it, I removed it (still have the plugin, in 'case'). I very seldom need to see an object's extremas, and it would be for me a distraction to have them displayed every time I select an object. I just use the menu version, when I need it.
But, then, I do almost entirely 2.5D tasks.
So... different tastes for different tasks!
Lloyd