Kimmuriel is not super good at the physical side of things so he will contribute mostly by helping with book-keeping and stock-counting and all that resource tracking busywork that needs doing. He has a Vested Interest in keeping the kappa at least somewhat loyal to the Alliance so it's not all done out of pure altruism but hey, he's willingly contributing.

If the Kappa need a little more fortification in their temporary home to feel safer, he will also suggest ways to basically boobytrap everything for security, as well.