Maybe you want to put your mod in the brl namespace?
Not a great idea... if you are going to add a module, you may as well give it your own namespace.
When you update your BlitzMax (whenever an update is available), *all* the Pub and BRL modules are removed and replaced with the updated versions. You (or your users) would then have to either re-install your module again, or go hunting for the original and copy it back into the new folder.
Using your own namespace you can completely avoid this.