There's a project called dbDOS that uses a customized version of DOSBox that has a feature that seems fairly useful: it's a Windows build that includes some extra items in the system menu (the icon at the upper left of the window that normally includes Move, Size, Minimize, etc.).

I've borrowed the code from this project for my own project, and I've added items like "Toggle full screen" and "Keyboard help..." which brings up a list of keys for changing CPU speed, etc. This seems to me to be useful for gamers, and I've been trying to prepare a patch that could add this feature to current SVN.

Unfortunately, the dbDOS code is based on an older version of SDLMAIN.CPP (derived I think from Megabuild), and I haven't been able to add this feature to current SVN code, despite hours of trying. I simply don't have enough knowledge to do it.

If anyone else is interested in working on this idea, here's the dBDOS website, with links to the source code. As far as I can tell, everything relevant is in SDLMAIN.CPP.

http://www.dbase.com/support/updates/#dbDOS

I'm only suggesting this because it seems to me that it could be generally useful to anyone who wants access to DOSBox's special keys but can't remember them. I hope someone might be interested in the idea. Again, I tried to make it work with current SVN, but I just don't have the required skills.