I'm planning on streaming some runs of AC04, but I haven't been able to find any world record times/speedrun times for this game apart from those listed on shatteredskies.net and the one run on speeddemosarchive.com. Since Grandmort hasn't updated shatteredskies.net in a few years and the "ace of aces" competition was over a decade ago, I'm pretty confident that there's been some better times that I haven't been able to find.
I'm also wondering a bit about what the timing schemas are. I'm thinking all are of course managed by the in-game timer, but I think that because you're able to reset a mission and not have that time count in your final, that such a run would be considered segmented instead of single segment. My understanding is that a single-segment run would have to involve no resets, and thus no deaths. Hope someone can clarify/verify this.