Performer, the things you are describing are same we have been discussing internally already. Dirty hacks could help right now but probably will not work for all cases. Separate TCP-stack is something you can get with Linux 2.6.30+ (separate networking namespaces). Maemo 5 is on 2.6.28 baseline where networking namespaces are not available, thus all this discussing with hacks.

As you are representing an operator business, would you be able to reflect on how important MMS is to operators? I know from statistics that generally users utilize MMS at a rate about 2-4% of SMS use, which is definitely very low and being replaced by alternative options -- email, direct social services communications, etc -- over time. But how important whole MMS business to operators?