I think it can be a good idea if we can select several polys and sceneries and flip all those at the same time. With this option, we will be able to flip entire maps, it will be funny. But if you want to make symetrical maps, you make the first half of the map and flip to have the 2nd half? I know it will not work same but it can be great for symetrical maps and it can't be so fair for two teams.

I totally think that non-symetrical maps are better... although this would be a good idea for other, smaller items.

Yeah, i know that non-symetrical maps are more realistic but it can be for fun.
I got this idea for small maps too, like voland, Equinox and some other are small and symetrical. I agree that long maps are better when they're not symetrical.
It can be good for CTF maps but never for INF, DM, TM, RM and PM.
So i don't got this idea only for halfing maps, i got this idea to flip groups of polys & sceneries like the half of long bridges and anything else like that.