Hi, Im the author of the metro launchers you found. I made a new one that does exactly what you want. Launching two apps, configuring which snaps to which side and it also has rudementary monitor switching. Its working fine on my computer but its always nice to have a second opinion before releasing it.
If you want to try it out, email me from the contact form so I can email you the file.http://www.itsjustwhatever.com/contact/