In one of my favorite movies of all time (and what, I presume, inspired this mod) the corporate liaison, Burke, eventually attempts to betray the marines in an attempt to try and bring back a xenomorph to the company.
Taking this with the fact that many of the other games on SS13 revolve around traitors, it makes no sense that the CL role cannot sometimes be rolled (or faxed by Weyland-Yutani) to do or be something treacherous. This is not something I think is optional, really. It is literally against the spirit of the Alien films for the CL to just be a hapless goody two-shoe, as treachery is in both of the original classics (as it is in Prometheus and Covenant as well).
Why Corporate Liasion would be a great idea:
1. It would give the CL something else to do.
2. It would make the rounds more interesting for people who stay shipside, especially the MPs who are so antsy due to how boring their job is that they'll arrest someone over the slightest infraction.
3. It would make the round more exciting just in general! Imagine if a CL was sneaking around the ship, up to weird stuff: sabotaging an engine; bribing a marine to smuggle an egg from his office (as Burke basically tried to do); or stealing something from the RD's room? Imagine how much more rewarding an MT's round might be if he found the CL sabotaging an engine and beat him down with a wrench, or if the MP found out that the CL was impregnating marines in his back office and put a stop to his evil deeds once and for all?
Perhaps the synth, as well, could occasionally be a traitor! After all, the synth in the original alien movie (Ash) also ended up betraying the rest of the crew, as did a synth in Prometheus and Covenant. Anyways, a traitor CL/synth is a fucking awesome idea and there's really no reason not to do it.