I used for some times years ago Amibroker and there was only possible, like I read on their website, automated trading with trading interface to Interactive Broker, that's still in beta.

1) Why IBController has BETA status?

The reason is simple - because it relies on IB API we have no control upon. You need to be aware of the fact that Interactive Brokers may and actually do change TWS and API quite often and any future changes in the API/TWS may produce incompatiblities without any warning. We try to adjust IBController as soon as such incompatibilities surface, but we can only do that "after the fact". Due to this there can be periods when IBController does not work properly with certain version(s) of TWS. That is the only reason why IBController is marked as BETA.
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Sorry but it's pretty obvious that you have not much experience. So I'm not sure how many times you wanna hear it but once again what you say is not true, not in the past and not now. And FYI you can build any custom chart trading environment. Also you could build DOM on chart too, for example.

As for what you call "beta"... to my understanding AmiBroker have clearly mentioned on their website why the IB trading interface has appendix "beta". Not because the interface is beta but because

Well,
I used amibroker for few time about 6 years ago when i studied VSA, there was a good indicator for VSA. I never traded with Amibroker and never see how to. So it seems you are an expert of Amibroker, why do not show some example on how to trading with it in a new thread on the Amibroker section? I think it can be useful to other people here.

P.s. Why on the Amibroker website under the features is not mentioned the possibility of trade and with which trading services?