1) I read on the Wookieepedia that Sullustans were instrumental in the evolution of lightsaber technology. Does anyone know where this is from? I smell fanon. 2) Is it conceivable that, on the back of their head somewhere, they've got hair? I'd be willing to bet they're mammals.
No idea about No. 1, but No. 2 wouldn't surprise me. They're basically* mice, right? *Well, inspired by them, I mean to say.
I've seen official illustrations of Sullustans with hair -- in the EGTPM, I believe. As to the sabers, fanon is my call.
This whole thread makes me laugh. I bet sullustans have hair in their jawal flaps, like in human ears and noses.