I'm wondering if the devs are interested in reintroducing underwater levels. I am capable of writing a program (not GScript, requirements being a gmap and its associated files in .nw format) that would automatically generate underwater levels.
Generating generic map-wide underwater levels would be processing intensive (could take a few minutes on a modern computer). However, there's a lot of value to be had from underwater levels (e.g. can your typical mounts swim underwater?).