Screenshots

If you want to take Screenshots in a DOS-Application, there is a tool called PCXDUMP, which can take Screenshots from a lot of graphic-modes, including some VESA-Modes.
PCXDUMP is Shareware, there no longer seems to be a webpage for it.
PCXDUMP v9.30

Mouse

CuteMouse is a very small, free mouse-driver for DOS. It's free software released under the GPL.
CuteMouse Homepage