I know the answers to earlier requests relating MED, and I fairly doubt that there will be applied any new feature to MED other than importing features.

You can set several vertices at a single point, when selecting them at once and scaling them down 'to zero'.

You can set several vertices into a vertical or horizontal row, when selecting them and scaling them down, while the scaling is restricted to vertical or horizontal.

Hope this helps.

EDIT:
Another suggestion:
You could use Atlas mapping with maximal stretch set to zero.
It doesn't manage to set all rectangular faces rectangular on the uv, but at least the most. And for the rest you could use 6-sided Mapping...?