From jfroco on that post:
Hello guys,
I developed a simple app (PTLauncher.exe) to run Project Tempest in Maximus Arcade. It may deserve a separated thread but I think you should test it before
1.- Install and test Project Tempest v0.95
Try to load a ROM, check fullscreen after loading it, check the controls are working, etc.
2.- Download PTLauncher.exe to the same directory as PT.exe
http://rapidshare.com/files/307671160/PTLauncher.exe3.- Configure Atari Jaguar emulation in Maximus Arcade Preferences using PT.exe as the executable... I mean nothing special here: do exactly what you would do with other emulators that do work directly from Maximus Arcade.
4.- Go to Pre-launch tab:
Check "Run Application on Game Launch"
Path: select the Path to PTLauncher.exe (Example: C:\Project Tempest v0.95\PTLauncher.exe)
Command line: %file
Path to media: long
5.- Go to Exit
Check "Close all additional processes started during launch"
And that's it.., don't forget to add Atari Jaguar to the Emulator Display List

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He actually developed one for me too, because I needed joy2key to run. If you need prelaunch commands like xpadder, joy2key, etc... download this version of the wrapper. Props to jfroco for making this...
http://files.arcadecontrols.com/details.php?image_id=3627