I'll go ahead and add my name to the list of people asking for additional chat mods.
I wouldn't consider this an issue if we had mods to cover most of the time zones during the day, but we don't. I feel very, very uncomfortable with leaving a chatroom without a mod on duty and it makes me feel as if I'm doing the community a disservice by doing so. However, as I have sleep and...other things...that I would like to give my attention to, there are certain occasions where I absolutely cannot afford to remain online until another mod appears.
This has been bugging me for a while now, so I hope this situation is resolved soon. If not, I'll likely have to resort to giving certain people that I think are trustworthy temporary mod privileges because I agree that leaving chat exposed to trolls for several hours is completely unacceptable, but as I'm not a god there's only but so much that I can do.