It works beautifully on a computer with one screen! and sure for 99% of people's needs.
But there is place for improvement, and I am not alone:

I am writing a piece of research and I use two screens (my laptop and a side monitor).
I would like to have not ONE but TWO applications running, each on it's own screen.

Wouldn't it be cool to have one application on each screen? I'd like to have an application to view other source documents in order to proceed with my research writing.

Sure this scenario applies to other people who have to read and write, not just creative writing.
And surprisingly, there are a lot of people who use TWO monitors, at least in the environments where the company provides a desktop and the user has her/his own laptop.

Looking forward to see this application evolving with the need of the users!

Thanks guys for such a great little app!

Hint: the way to chose the applications is great! Why not have one of this controls on each screen?