purchase a program called AEButtons Plus. The vuze only has 1 mappable button, unless you do the shortcut trick to remap the PTT
AE Button Plus
Then, you can reprogram the other 'useless' buttons like Vol up/down.
Once you do that, go to SBSH and look at PhoneWeaver (they have a free trial). With that you can make various phone profiles that you can call via a shortcut. match that shortcut to a button and you are all set.
Software for Windows Mobile Pocket PC: PhoneWeaver - SBSH Mobile Software (there is a discount code available in my sig)
If you want a free method, that isn't THAT specific, leave BT on all the time and just turn data on/off via the comm manager.