Now I know this is probably far out there and “never” going to happen. But possibly before Halo 2 PC goes out in the dark. Possibly 343i Halo Map Team “343iMT” could give it a thought of possibly making a couple maps for Halo 2 PC, just for kicks of course.
XHN SCRAPY
H2MT
( Also 343i if you need help getting started on making a Halo 2 PC map head on over the the H2MT site for tips etc… http://www.h2pc.org )