Remove RSA procedure, it's a partial flash of the phone's software. Smart-Unlocker does not support flashing in any kind. That is why "Remove RSA" option is not available for it.
To have this option available, Smart-Unlocker could be upgraded to Smart-Clip.
Best Regards
Smart-Clip Team
www.smart-clip.com www.GsmServer.com www.boot-loader.com www.smart-unlocker.com