Safefire PPP works great for me, you don't have to type a password in if you use the settings notebook in the PM-dialer, so it should work.The first time I used Safefire (1.0?) it closed on me too, but that was just a setting that I had messed up. Check that the settings are correct in TCP/IP settings and the settings notebook for SFPPP and then there shouldn't be any problem.
SafeFire got a helpforum at Yahoo if that won't solve you problem. Look for "safefire".
Med vänlig hälsning / Mit freundliche Grüße / Best Regards
//Jan-Erik