unsetting an option?

[John Hascall]

Is there any way to do "this":

# global option
option netbios-name-servers 192.168.123.45, 192.168.234.56;
option netbios-node-type 2;

    ...

	pool {
		range 192.168.32.1 192.168.33.22;
		# except here
		option netbios-name-servers NOTHING-FORGET-I-SAID-THAT-ABOVE;
		option netbios-node-type NOT-THE-DROIDS-YOU_ARE-LOOKING-FOR;
		...
	}

Thanks,
John