This is probably not possible, as you'd have added it otherwise, but me and Sheikah aren't relishing the prospect of typing in the console every time we want to play. Is there an easier way to launch it?
Open up your dosbox.conf file and scroll down to the very bottom. There should be a header titled "[autoexec]".
You can add lines of DOS commands under that section and they will automatically be executed when you start DOSBox. For instance, here's mine:
[autoexec]
# Lines in this section will be run at startup.
mount C C:\DOSBox-0.73\games\ -freesize 800
C: