The answer required is probably in this thread:
http://forums.crackberry.com/f3/expl...e-zones-46190/
The behavior the OP describes is WAD. If you are in your California office and set a reminder to "phone Joe at 5pm Wednesday" then move to NY, your reminder will adjust so you still remember to call Joe at the agreed time and you don't get him out of bed a few hours early.
If you travel regularly probably need to set the time zone for the appointment. If you miss this an appointment set ahead for when you reach a different zone will be incorrect. User Learning Issue.
For the record there are several differnet ways this is handled by various software. All are correct, none are perfect. The user simply needs to understand how the software is designed to work.