A question - are there currently any maps which work on the basis of requiring a simultaneous capping of zones to actually capout?
If not, is this possible?
I would be very intersted in this concept, in fact even enough so to dare to learn how to map eek!:P

eg.

the map has 4 zones which must be occupied by your team members all at the same time, then and only then does the capture occur. ie, there are no individual caps during the round..only one total capout or nothing at all.

This style would require a bit more teamwork than normal and defense and offense at the same time, because the loosing team could try and mount an assault on your weakest zone to scupper yer assault on their hardest etc. would keep everyone on their toes.

If it is possible, anyone else interested?

I don't think it's possible. At least not in a way I can wrap my head around immediately.

I first thought you could just make the cap zones disabled at first, then with a trigger brush extending exactly over the cap zones, you could set the trigger to add "1" to a math_counter entity, set to a maximum value of 4.

That way, once a player touched that brush, that would add "1" to the math counter, and only when that math_counter was up to 4, would it be set to enable the cap zones.

Problem is, anyone regardless of their team would trigger the cap zones, and once they're activated, you still don't have to cap them all at once to be able to cap each. So you'd be back to square one.

With a little coding, I can see how that could be done, but right now I doubt it

Sounds, good. I wouldn't do more than two at once though, it'd be way too hard on pubs. Also would be good if they were within eyesight of each other.
The simplest answer is probably the right one, try making two trigger brushes, not touching, and tie them both to a single entity (select both and then ctrl+t). Turn them into a dod_capture_area. I don't see why this wouldn't work.

try making two trigger brushes, not touching, and tie them both to a single entity (select both and then ctrl+t). Turn them into a dod_capture_area. I don't see why this wouldn't work.
Two people could still stand in one side and cap the flag.