In this case closemul would probably be simpler.
I'd pretty much forgotten about it and used autohotkey for everything until I was working on setting up my newest cab the other day.
I'm using it for Model 2 and Demul 0.57 as well. Now I just have to get rid of the friggin' mouse pointer that Demul v0.57 moves to the middle of the screen.
It would probably work for Supermodel as well.
http://vertrixgame.com/component/content/article/7/11-closemulPlace the closemul.exe and closemul.ini in the same folder as epsxe and change the ini file to read:
Exit Key 1=53
(you might also have to type "epsxe.exe" in the ini somewhere, but I think it works without it)
In Mala other emus setup, go to where the command line is for epsxe.
Add closemul.exe and a space in front of what is in there now.
There is no need to write out the name of the emulator and game name in the command line like in the example on the closemul webpage.
I don't have epsxe installed in Mala, so I can't guarantee this works.

I tinkered around with epsxe outside of Mala, but decided that I didn't like playstation games enough to warrant the amount of space they'd take up.
A quick explanation of why I'm recommending this instead of Autohotkey.....
Launching an autohotkey script while still having Mala launch the emulator can cause everything to just hang until the autohotkey script has exited. (which makes it useless)
The solution is to have the autohotkey script launch the game instead, but since Mala can't pass the rom name to Autohotkey, you end up having to make an autohotkey script for every game.
.....actually, now that I think about it, I wonder if the autohotkey script would still hang if it were added to the command line like closemul instead of put on the pre-command line in Mala. I'll have to experiment with that.