viewing only player combats is planned, but there is no option to allow that in the base game, so it will require some DLL coding.
the way to correct beta maps crashing is to correct them. I can't work on them while there are bugs in the core code, and I'm using the Stalingrad and Europe 39 maps to correct the core code, that's faster. T_KCommanderbly is working on those, they'll be more stable, and will be flagged so when it's done. Note that giant maps can't be completely crash-proof because of their size, the game engine is not made for such size.
there is no main menu button because of a bug with the base game: civ5 doesn't unload some of the files that are overridden using the VFS property to true, so going back to the main menu and launching another mod could have strange effects.