What exactly are you trying to achieve? If you think that you can make that 3G button do anything other than what it currently does, then the answer is no you cannot. My CAB only activates a button/function that already exists in CommManager, nothing more. Or you want to "force" 3G connection? If reading correctly, I believe that "Auto" does not do what you would like it to do... that's a phone/radio problem that you would need to try a new radio for (possibly)... maybe another OS or a Hard Reset will also fix... mine auto-switches properly and it did the same on many ROMs and Radios... some just better than others at that function though as expected.
I just did some research and our phone is WCDMA capable... I finally understand what you're trying to achieve but that's more of a scripting (MortScript) task or .Net excutable, or just pop open the band page just like you currently have to do.
Fuze Stats from
here, funny how LetsTalk.com gives identical definitions for Technology and Data Technology:
Network Technology
Technology WCDMA 850/1900 + EGSM 850/900/1800/1900MHz
Data Technology GSM: GPRS, EDGE, UMTS, HSDPA, HSUPA
My suggestion, if you want to know what reg entry gets changed when you flip the options on the band page, just take a full registry dump, then change options, then another registry dump. Then use windiff to find the differences...