Also, you can declare multiple config files, like this:
"C:\Program Files\DOSBox-0.70\dosbox.exe" -conf "C:\Program Files\DOSBox-0.70\dosbox.conf" -conf "C:\Program Files\DOSBox-0.70\apocalypse.conf"
The first config file needs to be full, but the subsequent can be incremental - ie only have those settings they're meant to change and nothing else. Autoexecs of both configs are executed in the order in which the configs were declared, so you can have the first config mount your games directory and the second run a specific game.
This is how I've been doing this - now I have over a hundred games set up this way, and just keep adding more.
