I know, there is no known way to reduce or "optimize" a mesh. I've made a few threads in the future forum related to it. MED is highly limited in what it can do.
What I normally do is just place a few vertices around and move the vertices as needed.
"You level up the fastest and easiest if you do things at your own level and no higher or lower" - useful tip
My 2D game - release on Jun 13th; My tutorials