I'd like to see Aleph One support M1 Shapes, Sounds,
Images, Maps, and Physics Models natively. M1A1 is great,
but it doesn't help us play 3rd-party M1 maps and so forth -
it's not a substitute for direct support in A1. As I understand
it, A1 already has the beginnings of such support in some
places... but clearly more work is needed for full support.
Aleph One 1.1 supports Marathon natively. 1.2 added co-op and net play. Third-party maps and total conversions are not officially supported yet, although they probably work if appropriate MML is crafted for TCs.