Are you the only sudo user on your system. If so, then simply make yourself a member of the wheel group and then uncomment the line in visudo top allow members of wheel to use sudo. You can run any command then as root.
If there are other admin users and you want to restrict the commands that can be run, there is a sample cdrom mounting example you can modify to allow using the userdel command.
# %users ALL=/sbin/mount /cdrom,/sbin/umount /cdrom
You could substitute your username or a group for users in the example and change the command run. Be sure you use the full path to the command. The example given has two comma separated commands.
There is one gotha to be aware of. You sometimes need to log out after modifying sudo or especially if you add yourself to a group. Group membership is read when you start a new session.