Registry Editors allows you to mess with the settings that are deliberately kept hidden from the users. I have mentioned this Windows Phone registry editor in the past but it is said to working only on HTC WP7 phones. Now, an XDA user has churned out an app that also works on Samsung WP7 phones, that includes Focus and Omnia 7 handsets.
Keep in mind that it works on only unlocked Samsung Windows Phone devices. Its XAP file can be downloaded from the link given below. Be very careful when messing with the registry keys as it is extremely easy to screw up your phone by changing the value of a certain key.
[samsung registry editor] (Xda dev link)
