There are a few options I have found. One is the Sony Remote Commander, this will allow you to release the shutter remotely but that is about it. Works
There are several other non-Sony timers out on the web. They all seem to interface through the IR port. I have the one from Tempus which is an interval timer.
I have not used it in the field, but worked with it a bit when I first got it and it does work. Only issue is that you have to figure out a way to attach it to the
As for a true wired remote, Sony does not have one, that I can find.