I've come up with a way to run the Mercalli V2 Fx from the Vegas timeline in a batch fashion. It involves a number of scripts inside of Vegas and also an external Autohotkey script for controlling the process. I've prepared a short YT Tutorial describing how it works. It's best viewed in 1080 fullscreen and can be found here:
I've tested it in V10, V12, and V13 on my Core i7 system and in V13 on an older Q6000 system and in V13 on a really old Core 2 Duo laptop which did require some timing changes.
It is still very much a work in progress. If you're interested in trying it out and providing some feedback and suggestions for improvement, here is the Dropbox link to the script files and installation guides.