So after a little googling this is what I came up with. http://dl.dropbox.com/u/1615250/senemodo.zip Seneca over at the foundry forums has a script collection that includes a quick mirror script inside "geometry creation and duplication" once it is run inside modo. Basically does everything but merge the verts. And there's…
k, I was hoping modo had a quicker way of handling this, I've been using the same method as you peanut. All this could make a nice script. If I find something I'll post it here.