RE: [request] view chat window in full screen application script
There are a couple threads about this type of script. Give it a good search and you'll find that I was the one doing something about it through a directx injection ... there were a couplee of probleems: it wasn't ready and my notebook's HD crashed and I lost everything I had done so I just left that idea alone.
There's wh WLM Preview Box scrippt.. which might work for you give it a try.
Other than that there's nothing that will do what you want.