can't edit/delete default assets
Submitted by Jay Cox
The brushes pallet won't let you delete those useless brushes that ship with the gimp. I know you can edit the brushes path in the preferences dialog to get red of them, but most beginners will have no idea. Unfortunately changing the brush path will remove all the brushes even if there were a few you wanted to keep. (This goes for gradients and patterns also)
RECOMMENDATION: gimp should copy (or ln -s?) the system brushes into the users folder when it is launched for the first time. Single user systems will never miss the meg or two this takes. On multiuser systems the admins can prune the system brush library.