I just had to reset my X2 and can't remember what I had that made the phone go back to the home screen after a phone call. Without it it just stays in the dialer, and that drives me batty!
This app called "On Call End" in the Play store should do just that: https://play.google.com/store/apps/details?id=com.brosix.callend&feature=search_result#?t=W251bGwsMSwxLDEsImNvbS5icm9zaXguY2FsbGVuZCJd
