If you have Dial from homescreen turned off on your BB, you can use shortcuts.
This is complicated, but if you follow the instructions EXACTLY as posted below, you can do all this withOUT a trackball.
Get there by pressing the green dial key.
Press Menu, press O for Options, press the ENTER key, Press the ENTER key again to open General Options.
Now, you should see halfway down the screen "Dial from Homescreen". Press ENTER until you get highlighted OVER the NO. Don't Pass it. When highlighted over the YES, press ALT and the NO will appear, press the N to highlight NO and ENTER again.
Press the back escape key (right of trackball) and SAVE should be highlighted, if not press the S for Save, and let it save.
Now you are ready for Homescreen shortcuts, where from the Homescreen, you can press M for messages, L for calendar, etc.,
Home Screen Shortcuts - BlackBerryFAQ.com
You will also want to use shortcuts with the message list, since you can't scroll up and down, some of those are listed here:
Tips and Tricks - BlackBerryFAQ.com