wildcatbeer,
I'm at work at the moment so I can't provide all the info you need but for starters you need mahutis led-wiz helper app from here :
http://forum.arcadecontrols.com/index.php?topic=55496.msg544702#msg544702Worth reading the whole post.
As for what you need to put into mamewah, well, you need to edit the mamewah.ini file and find the bit that says something about "application to run on startup" and add the commands to start the ledwiz app (swiftled lledwiz), then the command to run a sequence (swiftled 3backsweep.lwa for example).
You also need to stop the ledwiz app BEFORE you run powermame as pmame will also want to run lighting sequences. You do this with the "pre-application" thing (sorry, not sure what its called at the moment) and run swiftled xledwiz.
You also need to restart the ledwiz app when exiting powermame.
I found a delay when switching the ledwiz app on and off but your experience may be different.
Good luck !
PS My cab is in bits at the moment as I'm fitting t-molding (yes I should have done that first !) so I can't check the exact settings - sorry.
PPS Let me know your version of mamewah as the latest beta version has some extra ini settings that were easier to understand than the current "live" version.
Buks