Thanks for posting the link to my site and sorry for leaving it so late for joining this great site.
Just want to say there is a great program out there called Batchrun which you can use instead of the batch files emu you sacrifice in MA.
Link
http://www.outertech.com/index.php?_charisma_page=product&id=1In the frontend you use Batchrun for your emulator, point your rom folder towards where your batchrun scripts are located and change the file extentions in MA to .brs.
There you go you can still run batchfiles in Maximus Arcade and still have your master Mamelist.
Sorry for being brief but i'm on my wifes laptop on a train lol.I will update the website when i get chance