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u can do that, but most players cant. maybe the main problem is, that most of the good players play only 1 side - defence.

of course a good ass team can demolish def on a full server. but how often does that happen -  1/100(0) ? most of the time the player-constellations are in favor of defence and egoistic aspects like fragrate etc. dominate nowadays...

True, is old ... but 'limited'..? It depends on what you want to achieve - e.g. each Splinter Cell including the last Blacklist was build on the same engine and look, how different it is. Don't know how much you guys know about the map optimisation, but there is many ways to do it right - sometimes you have to sacrifice something in order to get better performance.
As for AI: AA developers approached this problem in a very different way than Epic, so most of native calls / functionality are disabled or non-existent. Most important, there is no CoverSystem implemented (didn't check the objective support) ... I mean, AA AI is in very basic stage of development - probably (scripted ...) is just for the E3 shows.
Basically, this AI is useless in the gameplay.

Well (), believe or not but I have 'some' experiences with game development - especially Unreal Engine based games and how hard (or not ...) it is. That said, you don't need the game source to be able modify game behaviour, extend its functionality or implement new features (I'm not talking about native stuff like rendering etc.). All you need is complete Unreal Script source code, good UDE and compiler.