Not by command line switches, but you can make a macro to do it and call it from the command line.
Go in word regularly, press Alt+F11 to bring up VBA editor. In the Projects window (I'm doing this from memory so the window is Projects, Project Explorer or something like that), right click on your personal macro workbook project (personal.xls) and do new module (not class module). Once you're in a new module type in the code attached to this message. Replace the filename with the path of your file. Save and exit the editor and Word. Save the module file anywhere you want if it asks.
Then type "winword /mOpenReadOnly" in command line.
Hope this helps.
Note: If you can't find the personal.xls project, go in Word and record a blank macro and direct it to put the macro in the personal workbook. Then just stop the macro. This will make Word create the personal workbook. Then go back to step 1 at the start of this post.
You can also copy this subroutine a couple of times (and rename it) and use it to open different doc files.