this is simply a variation of the traditional stochastic indi.
It is a smoothed version which I use with the lower TFs because it helps me better to filter out the typical noise of these TFs. There are pros and cons and it is really a personal choise ... I know it works for me.
In the higer TFs I prefer to use standard stoch becasue the TF already helps me to cut off noise and I would like to have quick response.
I do not want to break the rules !