I've used this script with my thieving grind and been thieving stalls for my xp.
So far so good i think it's great, but i'm going to make a suggestion for you to add to the script.
Suggestion: Add steal full invent then drop full invent additionally to (steal 1 drop 1).
As it makes the method more AFK-like and potentially reducing ban rate, Thanks for the great script and keep up the work!
Edit: i may be the biggest retard, as i've been selecting the options assuming you have to pick one but you may be able to not tick them and i guess it does steal 28 drop 28