That's one way to do it, but these will get overwritten by the GUI if you make changes to the site Quota. The only way around it is to edit the cobalt scripts to your liking, which is what we have done.
If Cobalt are listening (??) perhaps it would be nice to add a .pkg to update the GUI so that there was an option that allowed you to increase (or change) the percentage that log files are allowed to grow to - currently 10% of the allocated site size.
Perhaps even site-by-site although system wide would be probably easier? Thank you.