From my long usage of Profilematic, I noticed that the 3G - 2G rule or vise versa switch will still carry out even though there is data transfer going on e.g. downloading files. The only time that the rule will not happen is during the phone call. I wonder if it's possible for Profilematic to observe the activity on "Transfer"? Though that still will not prevent the switch from happening while downloading happens beyond "Transfer" e.g. downloading podcast on gpodder, but it helps a little. =)