I bet they would make a good hunting dog. If you can somehow convince them not to imgregnate the game.
I plan to make a chryssalid farming mod:
Mind controlled lids that breed (through advent troopers) would create tame chryssalids, that basically have imprinted on the MC or whatever. If their parent's controller dies, the tame chryssalids are untamed. Tame-born lids will be extracted alongside XCOM soldiers.
I'll add a lid habitat facility, unlocked by lid autopsy and some sort of advanced psi. This is where the chryssalids will be kept. When someone inevitably mods in live captures, capturing an ADVENT soldier will allow you to throw them into the habitat, causing you to either lose 1 or gain 3 lids, with a chance based on what kind of soldier you toss in.
You can take chryssalids on missions instead of other soldiers, provided you have a sufficiently strong psi operative along as well (ie: knows dominate).
Tame chryssalids will be available for base defense missions, much like how captured turrets are.
There would be a dark event that would immediately un-tame all chryssalids, initiating another base-defense type mission, where you have to save your personnel from the swarm of now-hostile chryssalids that's in the middle of your base.
Is this not the dumbest idea you've ever heard?