Are you looking at disabling the voice dialing app from being activated when you hit the side button? If so, you can set the key to open something else, or do nothing. Go into Options->screen/keyboard (i believe) and you can change it to something else there.
The other browser I believe is the default BlackBerry browser instead of the wap browser your phone company loads on there.
BB browser will be your better browser until bolt gets tuned up imo. Never a fan of the browsers the phone company's put in there. And as far as disabling the voice dialing....go to Options/Screen&Keyboard and scroll down to the Left Side Convenience Key and change it to "Nothing".