Follow http://www.gamesas.com/bgsforums/index.php?showtopic=1012957 instructions, replacing every instance of "c:\dosgames\(etc)" with "~/dosgames/(etc)". You still want to mount a virtual C drive; just use this method instead of the one posted. For instance, to mount "dosgames" in your user folder as a virtual C drive:
mount c ~/dosgames -t freesize 1000
This will mount "dosgames" in your user folder as a virtual C drive with 1000 megabytes of space.
~/ points to your user folder, so as long as you have the dosgames directory there everything should go pretty smoothly.