Write 'Nice' Messages to native log file via App Engine PeopleCode

When writing to the App Engine Log file via Peoplecode's MessageBox function it works - but it is very ugly for end-users to review.

Is there any other way to write to existing, native, log file? I am aware of creating separate custom file to write to - I just want to use the normal .log and have it readable for end-users.

Is there unknown parameter to not write message out twice?

This is too much for a single MessageBox call. Just want the first line - as rest is redundant (and ugly!):

"Amazing useful Message to user(0,0)
   Message Set Number: 0
   Message Number: 0
   Message Reason: Amazing useful Message to user (0,0) (0,0)"