Logged In: YES 
user_id=6405

send_message is still a bit specific to nosy messages, and I doubt that  
will change any time soon (making it too generic may make it too  
complex). Have a look at the roundup-reminder script - perhaps it  
could be used for additional clues?  
  
If you do come up with something, please consider contributing a   
section for the customisation doc "examples".  If you need further 
help, please discuss on the -users mailing list.