Disable GPRS on Focus

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http://forum.xda-developers.com – I'm just curious if there is any kind of registry editing or something like that could disable my Samsung Focus from dropping down to GPRS signal? I'm not looking to disable the internet signal entirely, I'm only looking to either drastically lower the priority of GPRS or disable it so that I only connect to EDGE and above. My phone connects to edge just fine at about 3 bars of signal and works great, but as soon as I get 4-5 bars of signal it automatically drops to GPRS, which makes no sense to me, I would rather have 3 bars of signal and use EDGE service than to get a better signal on a dras (HowTos)