That's not a native option/setting, but SPB Mobile Shell is among the third-party options that enable full customization (or pseudo-replacement) of the Today screen. AT $30 is may or may not be worth it to you, but the free trial is definitely worth a look.
Does anyone know how to adjust or reset the main screen on windows mobile to be a key or dial pad? Although I love all the features of windows mobile, I don't want anything more on my main screen other than a dialing pad and 1 touch contacts button. Can anyone help...ie direct me to a 3rd party software or a system setting?