Swen mentioned this in the latest round of updates, and I think it's a great idea. E.g. my GF is not a hardcore gamer, and has an old laptop she can't run DOS on, but I think if I could hook up my laptop to a big screen that would work well!
I would also like to suggest support for dual mice, should be simpler to adapt the UI for and have a faster turnaround.
If you meant
this kind of big screen, I'd agree with you. If it's only one screen and no split screen, it would be hard to navigate if you wanted to go south and your girlfriend wanted to go north.