When I have my Blackberry Bold in vibrate-only mode, I can't distinguish phone calls from e-mails, text messages, or calendar events, until the third buzz. I have it set up to buzz just once for e-mail and text, twice for calendar events, and more for phone calls. If I were able to edit the length of the buzz for different events, then I'd be able to know it was a phone call sooner. Any suggestions please?