Not sure if I'm missing the point. I tried to to do this as is shown in the WIKI, but that doesn't seem to work.
The screenshot from the WIKI I can only find in the global compiler settings. There is of course no suitable compiler and there is no option to add a new compiler, so I was trying to do it with the "**No Compiler**" and adding the command line in that window. As soon as I close the dialog and reopen it, the commandline is gone and dialog is as empty as it was originally.
I haven't found any other option so far. I know I can add a compiler for this but then I have to mess again with the XML and setup files as I did when I added MASM32 support. I guess I have to do it this way for now. It would be great though if there would be some setup where one can add new compilers more easily than this. Maybe this is a planned feature for a future release?