.fixlen - Allows a bot to change the length of a tie once hardened, which can be determined when the .multi sysvar is not zero. .fixlen must be a value between 1 and 1000. If a tie exceeds 1000 length the the tie will snap and the bots will fly backwards due to momentum. If it is set to a negative number it will be modded to a positive number. This affects the tie with the tieport stored in .tienum.