Hi,
Nope. The dialog is completely unresponsive to any key other than return/enter.
I'm doing some work on the mac port. This will be fixed in the next two months (I hope :-P).
You don't understand: switching between windows and switching between applications are two different things on the Mac. Using command-tab switches between applications; command-` switches between windows within an application. When command-tabbing between applications, all you get is the application name; this isn't anything specific to Vim. It's how all Mac apps work, e.g., if you've got a word processor with multiple documents/windows open, all you'll be able to see when switching is the application's name. Yes, the Vim window title-bar reflects all the usual information you see in it on other platforms, but that does you no good when switching between Vim instances.
I'll take a look at that as well. Bye, Nico
