Is opening a seperate window and tabbing it not something that works for you? Or do you not use ALT TAB to switch between apps?
I guess ultimately this would be a question of which window manager you use on how to setup something like that? In fluxbox, from your description, you could enable tabs, and then tab all your applications together, simply tabbing between them with either your mouse, or ALT TAB.
Or, maybe I'm missing the idea all together
Cool