As you well know
, meshing can take up some time and the difference in polygon size by a small fraction can make a huge difference in your output. Often, by the time i make a tweak to my mesh settings, and mesh it, if i'm not staring at the screen when the mesh preview is done, i forget what the prior one looked like and you don't know how valuable the changes you made were. In addition to that, perhaps a way to also catalog the time it took to mesh. I think this would be a tremendous help in making tweaks for final output, saving time, and being able to balance, hey, this change made this much of a difference in meshing time, but the visual value was or was not worth it. So in other words, it would be a 'render viewer' even though you're just meshing and not technically rendering.
The interactive mesher is great but I think this kind of functionality addition would really just take it to a whole other level and be extremely valuable; especially when because of the greatness of Realflow, we are all becoming able to work with larger and larger meshes (a little sucking up here can't hurt right?