Well, if you look at this rather old screenshot (from late December 2005, of which hasn't changed), you'll see that the size value is shown, the quants size, but you cannot edit it - a dumb thing to do.

Using the size input field (8.28 - meaningless) affects all 3 axes and a size of 8.28 is not always the same size either. The best way of having MED much better is to have some sort of side banner (like WED does) which contains tool options, a list of UV maps and other commonly accessed things like the skin edittor and creation of UV maps. I have intentions on making a heavily modified screenshot of MED to show all this. It would be my "dream" MED, if you so speak. It's otherwise very vivid in my mind on how I'm "seeing" how my "dream" MED would be.
My 2D game has one major philosophy (sp.?): if something can be customizable in some way, make it customizable. In my 2D game, you can configure virtually anything in practically any way. WED, MED, and SED should all have the same.