1. The info box is hidden only to non clan members ( based on the CLAN userclass ) so that war info can be talked about without giving away stuff to the opposition or anyone who might abuse it.
Once you have set a wars results, its contents will visible to all.
2. I do not know, will have to look into this.
3. First time I have heard of matches doing this, its a certainly a new concept to me changing game styles during the match.
It would require major re-coding to support this so its not going to happen any time soon.
The only thing is you might want to consider duplicating the maps and prefixing there name with the gametype.
4. Not going to happen, I think thats going overboard and a waste of time. If you want something with that detail then look into some sort of server log parser that can generate those stats automatically.