The described setup doesn't even work with ExtSheet (1.02.21 based fw).
It's not possible.
At best you can mix sheet & std or wall & std mode but this only works with ExtSheet (1.02.21 based fw)!
I find it hard to believe that you weren't able to find any info on this subject on the forum... so I guess you haven't found the wiki on moviesheet setup either yet?
http://wiki.wdlxtv.com/How_to_use_Movie_sheets_v2Tip of the day: When you setup moviesheets, get ExtSheet/Linksheets running plain simple from usb drive
BEFORE you try any advanced feature (network shares, MSHEETDIR, DEFAULTSHEET, .forced_std, etc..)!