You mean using scalers? That exists in UQM 0.6.2 and all current scalers have existed since v0.5.
And network play... also exists in UQM 0.6.2, which means it's been there for almost 4 years (version 0.6.0, the first to have NetMelee, was released in Dec 2006). It gets played all the time, with games set up on #uqm-arena (IRC). Plus, there's another mod based on v0.6.2 designed specifically for net-melee, made by Shiver (with help from others).
Thanks for the corrections! I never played UQM, as I'd played the original PC and 3DO versions, so the whole package is a bit new to me. Everything else I said about the project still stands