Actually, I've seen it posted a couple times, but I don't know if it was ever answered.
I checked the kitchen Build thing, and there is no specific option for BTDUN (Bluetooth Dial Up Networking) in the kitchen.
My guess is, it's not there.
Goggling around found this over at xda developers
http://forum.xda-developers.com/showthread.php?t=333762
You can get the cab to enable it here
http://www.winmobiletech.com/sekalaiset/WM6_BT_DUN.cab
Read the post above for more info, including a minor issue when you finish using BT DUN
And do post back here if it works - kitchen team, verify no BT DUN in the kitchen???