the systems are long only, been covered 1000 times. Again they were originally designed for 40K retirement like accounts where you you can't short easily except for inverse ETF's

also - shorting is a FAR FAR different beast than going long. Corrections and downtrends tend to be over quickly, are very emotional and end in washouts and capitualtions 

uptrends esp in the indexes last far far longer, prices tend to chop higher for long periods of time and go on longer and farther than you think is possible at times; topping is a process and uptrends can go for long periods of time, which the KISS long systems attempt to caputure.  The system has to give enough room not to be stopped out all the time on noise

you can't simply do the inverse of the KISS system for shorts - as I stated downtrends tend to over quickly, are fast and volatile. For shorts - you can't give them ample room like you do with longs: the logic would have to be MUCH tigher for shorts and with some addional rules for simply taking profit and closing out vs waiting for an  STS stop to be hit, or using extremely tight stops vs what you use for longs.

I've gotten the system to work on some inverse ETF's but I have to use extremely tight settings, and even though really some other logic needs to be in place as well. 

the KISS systems are pretty cool though: in their ability to caputure at least the gains of buy and hold if not 2 to 5 times more, all while taking 1/7th or less of the draw down. The fact that they can do all that only playing one side of the market is pretty amazing