Nokia 6620

I wonder if anyone found a way to change the default programs on Nokia 6600/6620. For instance, if while browsing files I choose "send by e-mail" it will open the default built-in e-mail program, and I cannot find a way to set up up so it opens ProfiMail (unless, of course, I'm browsing in ProfiExplorer). Or the MultiFunction Button on Motorola Bluetooth headset opens built-in voice recognition program, but how is there way to set it up to open VioceDial or any other programs. Thanks!