I just started using Dosbox, and I think it's a great application for emulating a dos box. But there are a few things that I miss.

For started, when I click in the DosBox window it grabs my mouse, that's good. But I want to be able to get it back again when I need to do something on my system again, without having to go out of the game I'm playing.

Also, a De Fullscreen would be a good idea to implement.
Only way I found to get out of full screen was to exit the program.