Removing brake from SRAM 7 speed hub
If you have not already bought this hub, then it is possible to get a 7speed Shimano Nexus hub without any internal brakes.
If you already have the bike with the SRAM 7speed hub, then the brake can be disabled by removing the cable. However, you will still be stuck with the external brake housing (including the metal arm that has to be clamped to the bike frame) as this is part of the overall hub axle spacing and provides some weather shielding for the axle bearings.
Paul