I don't recall ever having seen a general pref that covers all instances of new windows, although I have seen the front/back option in (at least) Mail.
Have you looked through TinkerTool/TTSystem to see if either one offers the option?
The new Great Equalizer is the SEND button.
In Memory of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire
