Feature request: Source IP for dns requests

Hi,
I think that you should add option source-ip for IP>DNS. Sometimes, we have got many IPs on one interface, but some dns has ACL.

You can do this through NAT. Its not as clean as an option in the DNS settings, but it works:

/ip firewall nat
add chain=srcnat out-interface="WAN Interface" protocol=udp dst-port=53 src-address-type=local action=src-nat to-addresses="Some IP you want"

Thanks.