Setting up sudo on FreeBSD is simple. First install sudo using ports:

Once sudo is installed you need to specify what user will be allowed to run root commands. In this case I wanted to allow the user fred to mount remote windows shares on the FreeBSD box:

Add the following at the bottom of the sudoers file, substituting fred with a username on your system:

This will allow the user fred to mount windows shares and unmount any filesystem.

Another note: If you would like the user to be able to use the sudo command without being prompted for a password simply add NOPASSWD to the end of the allowed command list, such as: