Fuel Dump Provisions are also an option on the 767s.
IMHO spending money for that pays back after the first near MTOW - Landing which in almost every case ends up in flat tires, glowing axes and fire brigade appearance at the aircraft. (Think of the PAX !)
Just a small amount of "return to field" landings are due to fire or any other immediate reason, so that you have time enough to get rid of 30 tons of fuel (767) in order not to stress the aircraft and itīs value which pays off, too.
High density seating gives You a high ZFW. So at least the "english style" interior should make use of the option.
As far as I know a dual hydraulic failure of an A330-200 gives you a required landing distance of some 3500 m.(heard of)
Good for the guys operating out of Orlando with the near by Kennedy Space Center....