Quote: "I think that in the update 1.17 this will be possible, don't take my word for it."
Afraid not.
Quote: "But cant you make it into a segment mesh by giving it an fpe?"
Wont make any difference.
As far as enemy collision goes:
Previously the best you could get away with was 3x3 segment size, but even that has never worked in x10.
Dark AI has collision issues with anything other than flat floor segments. Standard AI works fine with single segment sized angled meshes but your never going to get away with a single large terrain mesh if you want enemy collision.