I would like to see the ability to be able to customize the "senator" title for an empire so that it could reflect the empire concept or theme. Functionally, it wouldn't be any different than senator other than having a different name. For example, for my Kzinti empire, senators would instead be called Heroes in keeping with the flavor of the empire.

Also, I had someone join my empire recently who had been a senator in another empire, but when they joined the Kzinti they were still listed as a senator even though they had not been promoted. I dont know if it is supposed to work like that or if it just something that had not been thought of by the devs.

Sentient species taste better...