Thanks for posting the answer, it may help others.
To clarify, only the "VNCSERVERS=" lines get combined, the "VNCSERVERARGS[ ]=" lines remain separate, i.e. the core of your file looks like this:
Code:
VNCSERVERS="12:dan 13:joe 14:mp2 15:greg"
VNCSERVERARGS[12]="-geometry 1024x768 -depth 24"
VNCSERVERARGS[13]="-geometry 1024x768 -depth 24"
VNCSERVERARGS[14]="-geometry 1100x1100 -depth 24"
VNCSERVERARGS[15]="-geometry 1280x1024 -depth 24"