Default Brush Parameters Documentation
There's an option to change default parameters definition to any brush cgf. That can be usefull for pre-setting things like ViewDistRatio, LodRatio etc.
To store default values, first set Brush Params to your desire and then click the Save Defaults button in Brush Parameters section of brush options. This will create the *name of the cgf with extension*.dfp file at the cgf's location, that can then be submitted so everybody is able to use it. From now on, everytime you insert this brush into the level and you have corresponding .dpf file on your hard drive, the brush will be set up with these new default parameters. So it's wise to create .dfp file as soon as you create new asset.