I did this nn it worked... install hancent (duh) manually open hancent app (might not be necessary) lock phone unlock to sms should ask which app to use
I tried it and now it will launch handcent but the counter on the lock screen still refers to android mms not handcent.
Meaning i still had to open android mms to clear it out.
Is there an option in the stock mms to disable notifications?
Then you can choose the settings in handcent to only notify you.
This problem is most common when having two mms apps installed.
NOTE:
*From experience with other ROMS*
You should not uninstall the stock mms. Handcent uses it to send and
receive picture messaging.