Users able to delete own comments without Administer Comments Permission

I'm probably putting this in the wrong place, and if so I apologize.

I've installed this module and it works Great!! exactly what I needed.....but.......Now all comments are flat it seems the next logical step (well as far as my users tell me) is to have a permisson where users can delete their own comments. They have the ability to edit but not delete. the Administer Comments permission would obviously give them the ability to delete anyones comments (not desirable). A permission that just allowed own comment deletion would be great.

I just wish I had the brains to do it!