Cyberdisk does everything in its power to not be taken alive!
in user\mods\Piratez\Ruleset\Piratez_Faction.rul find STR_CYBERDISC_TERRORIST(the one with rank and race), for me it was row 17057, go down to capturable and add liveAlien: STR_CYBERDISC_TERRORIST in a new row under it. don't forget to use 4 spaces instead of tab, or else the game crashes on launch. if you want I can share my fixed rul file too.
+ a question to the dev: STR_ARMORED_CAR_TERRORIST and STR_ARMORED_CAR_NAZI_TERRORIST both have a live alien item, but they are also capturable: false, so they are instakilled if knocked unconscious. it shows up in the log as a suppressed error, so I would like to know if they were meant to be capturable.