looks like da_Reeseboy got the sip change option working and was helping mystery. I have been using your kitchen to build a rom to get this working but i belive it has to do with setting up biotouch. It's little advance for me ut mabe if you got time you can take a crack. Here is a post from da_Reeseboy if it helps.
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http://forum.ppcgeeks.com/showthread...ip#post1087512)
Use this biotouch version:
http://forum.xda-developers.com/show...&postcount=272
You also need HTC Scroll 2 to get the sms contacts autocomplete working.
Hope this helps