Unfortunately right at the moment, bluetooth dialing is only available on 2.2. If you really want it, your only option is to root and put a 2.2 custom rom on your phone. I have real bluetooth dialing on both my Dream and my Magic running CyanogenMod CM6.0. It works very well.
Someone correct me if I'm wrong, but I don't believe this was a Rogers or an HTC issue but an Android issue. I don't know why they didn't have it from the beginning? These days it is a basic function that most dumb phones can do.