The DSI x has been supported since 4.11. The latest version of MaximDL is 4.60 -
http://www.cyanogen.com/down/MaxImDL460.exe.
The DSI II and Pro have the capabilities to output in FITS format (default). The regular DSI outputs in raw only. The set up guide also infers this -
http://www.cyanogen.com/help/maximdl/Meade_DSI.htm