is it possible to have the game simply kill a worm that enters negative space or reaches the value just before it laps over to negative space? is it possible to enforce said limitation with a revised TS version 4? (maybe 4.1?)

roughly 45 minutes to finish flying in this replay -.- (we quitted and i watched the replay at 19x speed, game time was 45~ minutes)

Yes - quit using hacked engine versions.
Also, read the readme, it's there for a reason.
Also, quit wasting everyone's time.