Does DHCP on dd-wrt support the absence of the default route?

I have one reason to flash dd-wrt onto my router (rt-ac66u), which is to be able to not assign any default route via DHCP. The stock firmware doesn't seem to be able to do this. Dd-wrt appears to be using dnsmasq as its DHCP server, which in itself supports this with dhcp-option=3. Since I understand an install is not without some risk, and that I apparently can't expect this functionality even from router manufacturers, I wanted to confirm beforehand whether dd-wrt definitely supports this? Or will it insist on itself as a default route (like every other router I own) if I leave the option blank?