shock_
Well, I double-checked my setup for Visual Pinball and the path I use is as follows (note the backslash instead of a forward slash):
-play -"%path%\%rom%.%ext%"
Not sure why you need a forward slash to make yours run. Perhaps you are using a more recent version of Visual Pinball than I did at the time of writing this document. To tell you the truth, I have not played Visual Pinball in a while now, so that might have changed, but I can not be sure.
DJ Infinity
As for the Visual Pinball wrapper ...... I do not use a wrapper so this is why there is no mention of a wrapper in my "Mala How-To" document. I simply documented everything I did to configure all the emulators I have added in MALA. I believe the Visual Pinball wrapper allows exiting of the Visual Pinball application to occur when the ESC key is pressed instead of having to press multiple keypresses in order for it to exit completely. This might be handy for some people, but I did not need this since my keyboard encoder (Hagstrom KE-72) can issue many keypresses at the press of one button only.
Now, as for the format of my document, I believe the format is pretty good. Without referring to MALA at all, I first indicate the complete directory structure I used, showed people how to install MAME (since MALA requires this to be installed already) and finally show people how to install Visual Pinball. After doing this, I then proceed to tell people how to configure MALA with all the emulators. Now, shock_ was correct when he indicated page36 shows how to test Visual Pinball from the command line, however, if you read the section entitled "Installing Non-Mame emulators in MALA" you will notice I clearly detail what every line of the MALA configuration screens should be populated with for each emulator (including Visual Pinball). Under subsection 10) I list what the executable line should be for each emulator. In this subsection you will notice Visual Pinball is listed to have the -play -"%path%\%rom%.%ext%" executable statement.
Anyway, I can easily understand people might find the document a bit lengthy and that some people probably tend to try to skip around through it, thus causing them to believe the document is hard to read. If you read the document from top to bottom one time hopefully you will understand the sections and how they are laid out better.
Now, if you are still having trouble regarding Visual Pinball, I can try to help you out, but I still believe a lot of what you are looking for is already included in the document (except for the use of a wrapper, since I do not use one myself).