I just used the 3 cab package. An Arcsoft/sprint pic mail remover and a generic icons version or a customized one. Ported from a treo 850 to work perfect on the TP. It was made to allow you to set the correct data path. I had to switch pic/video options from "internet" to "my isp" in the list. It works great on my TP...I sent an instant video, a pic and regular sms all from the same threaded conversation with a friend last night...no waiting or infinite sending fail crap like my first experience with pic mail. As for the reg entry you posted on mine, it references a treo 850. It works great right now so I'm afraid to change it, should I need to worry about it actually matching my TP? I will post the link where I found it if I can find my bookmark or history.
see this--->
http://forum.ppcgeeks.com/showthread.php?t=61802