Centaurus,
'Surface wind' is measured at 30 feet. Don't think it's going to make a lot of difference to the 50 feet wind, which should be your threshold crossing height. I'd be more concerned about the 1000-2000 feet wind, which could well be a 30 kts tailwind. This might make it hard to establish a stabilized approach by whatever your company's requirements are.
BelArgUSA,
My company allows 15 kts tail wind landings (B738) at a limited number of destinations (where there are no instrument approaches to the opposite runway for instance). This may be combined with additional restriction as to landing weight etc., but is always subject to detailed performance analysis to ensure the safety of the flight.
To me this sounds like a much more competent approach to the issue than an outright 5 kts limit.
If I need to choose between a circling approach at night with wx close to circling limits or a straight in ILS with 14 kts tailwind then, subject to landing performance considerations, I know what I prefer.