I haven't tried long wands (2 hands) on tropical flats, although I've given some thought to fighting big stuff like tarpon or sharks with the big rods - the extended butt and bungee seemed to offer some advantage and I always wanted to try something like that. If it's anything like 30 pound chinook in a river or 20 pound chum, smokin' hot summer steelhead, 17 pound bluefish, or cow stripers, then it should be applicable.
As far as casting, I would imagine that if you can cast as far as you can see in the water then a single hander's fine for sight fishing.
I've been talking about two-handed rods out there for over a year and the majority have always been opposed to the concept (although things are changing lately), so I'll stick to less controversial topics like mission statements!
I'll send Josko (the world traveller) email to see if my .02 is worth... well two cents in the two-handed tropics.