Since transferring between bulkheads can cause both of us to randomly crash, we may have to do segmented to preserve sanity. We managed to save a corrupt game, and our inventories / nanites were wiped when we reloaded. It's possible to save games, but it's not perfect. If the majority want end-end, that's fine. While an end-end might be a traditional way of showing the run, I think a split screen would be more interesting to watch. Lastly, I'll look into additional audio commentary if the split-screen format is used.

I found another group of guys doing a SS2 speedrun, and they concluded that both death-teleporting and knowing the keycodes beforehand is acceptable.

There are things like death-teleporting that is possible with the game mechanics, but I know that's asking for a time penalty (and generally frowned upon).

Moreover, when one player picks up cyber modules, the other player receives the same amount. You don't share inventory, nanites, or upgrades (OS / cyber-module). Thanks for the replies, I have a few comments:

System shock 2 co op speedrum