Typically with other 3.2/5th Edition devices, you can change the preferred destinations or access points for individual applications, ie, the browser can either use a specific AP, use a specific destination, or give you the option to choose each time. If the widgets give you the option to do the same, you should either set it to connect to a separate destination that ONLY has an EDGE/3G AP in it or just switch it to that particular AP in general, if it lets you.