Probably not. I am fairly new to BlackBerry, but had Smartphones for years. The Smartphone will not change from zone to zone as that will then change all the times in the PIM. So, in Cingular, for example, as with most other provides, the network will change and keep the time on a cellular phone, but not on the smartphones. I surmise the same thing applies to the BlackBerry.
I found it easier to just make the adjustment in my mind (7 central at home, so iit is 8 here) than to mess almost 800 appointments. HTH.