dhcp options for shared connection?

[Razvan Cosma <rg cosma name>]

Hello, 
Is there any way to add a dhcp option (next-server in my case) when a connection is set as 'shared'?
I see NM starts a dnsmasq instance with parameters
/usr/sbin/dnsmasq --conf-file --no-hosts --keep-in-foreground 
--bind-interfaces --except-interface=lo --clear-on-reload --strict-order
 --listen-address=10.42.43.1 --dhcp-range=10.42.43.10,10.42.43.100,60m 
--dhcp-option=option:router,10.42.43.1 --dhcp-lease-max=50 
--pid-file=/var/run/nm-dnsmasq-eth2.pid
and I dug through /etc/NetworkManager/system-connections and read (briefly) the libnm sources but the parameters don't seem to be specified there..
This is in the Gnome interface of Ubuntu and Mint. Now, I do know how to fully configure dnsmasq myself, it would be very nice though to keep it integrated in NM