I understand better of what you're asking for. For two terrains to actually become one terrain, yes? I mean, you can transition two terrains seamlessly into one another, but it's a lot of work. I haven't done it myself, so I can't say exactly how, but I know Mipsy has, and it took a while. If the two terrains are perfectly aligned, terrain and AI grid transition seamlessly. I guess requiring the same height (which could easily be accomplished by using the clamp tool) would be relatively easy for making a merge. Would be a nice feature. Any new features would be nice...
