>I don't know a way to solve your problem, but one trick that'll make
>your current behavior a little nicer is Control + Option + W, which
>closes all open tabs, rather than jamming on Command + W.

That would be a help, but it's not working for me. Can you tell me where it is in the menus (I can't find it), so I can adjust it with Menu Master? Or if it's not in the menus, how do I get access to it?

There's a slip in the first-quoted message: it's control-COMMAND-w to close all tabs, and the menu it sits in is "File".

Cheers,
Paul