See this thread for various alternative maps:
http://www.axisandallies.org/forums/index.php?topic=30553.0
If Russia can attack a neutral Turkey then why not the UK?
But you’re right, since Turkey is likely to go to war T1 there’s little advantage for the Allies in not attacking it (unless you favour a house rule banning the Allies from attacking neutrals).
The point of Austria not attacking a neutral Italy is that it denies Italy an entire turn to collect income and build units.