> I don't automatically merge the vertices there right now because that would mess up the uv texture mapping information which is also included in the .obj file as well...
> I suppose that I could add automatic merging in as an option. Maybe it should be on by default if more people are expecting to have merged vertices than expect to have distinct uv texture coordinates along the seam.

Interesting info here. So far I didn't try to texture one of my MoI models so I didn't notice that UV coordinates were included in the OBJ.
Now, what happens if I merge the vertices in another program. Will it create some mess in the UV coordinates ?
Anyway, merging as an option (selected by default or not) would be a cool feature.

Schbeurd