What version are you using?
Doesn't really matter, the brushes are presets.
You could use each one, change to your desired settings and then save over the original, then save the brushes .abr.
You probably don't use all the brushes, just load the ones you use most often change the settings and then save them with a suitable name, the save the set.
Use the preset manager(in the tool options - go to the little arrow symbol, open the menu, scroll down to preset manager) to edit the sets and save them, you can delete all the other brushes, they are the default brushes and will be reloaded when you choose 'reset brushes'.
Moe: It could have been a real ugly situation, but luckily I managed to shoot him in the spine.