Hmm, this could be very cool, but I think it should be low on the priority list. Anyway, I guess to make it realistic (like real soldiers melee), you could have fighting - go martial arts on those Tamans, since they look easy to take, but also wrestle, since there's no way to beat up an Ortnok, but wrestling him could take that particle cannon out of play for a few turns. Of course, wrestling an Ortnok would be harsh on your HP, especially if he decides to smack you around a bit before going back to that cannon of his.
On the other hand cracking some Taman ribs could get you an early live alien... Anyway, I'm getting ahead of myself.