The rpg element wouldn't really be all that bad, it depends on how the theme goes.
Say that it's medieval europe and you are aspiring to become the lead interrogator/torturer. You start off by random encounters to hone skills and learn the game basics. Then you move up to working for a local lord where, through tickle torturing people, you gain experience that you can put into different aspects of your trade.
We could implement a tool area that makes you more proficient with using tools on people. You could specialize into different areas that allows you to torture those areas more effectively, with obvious downsides (you specialize in feet, but you get someone who is essentially not ticklish on their feet). 'Course we can apply basic manual techniques that you can level up individually. There can also be an intuition level we can raise that makes you better at guessing what areas are more ticklish and finding hot spots when you search for them.
In case you're wondering, yes, I have thought of all this before. When I originally came up with the idea I had whole trees to be implemented so that you could specialize in whole different aspects of torture, part of it also included concealment so you would not be caught while trying to level up randomly when you break into people's houses...but I digress.
It's all about the setting that determines how the game can be set up. It would be more challenging, but if we do it set up somewhat like the sims we could potentially allow people to play a lee or a ler, obviously with the lee being much more role playing intensive (just because it's a lot easier to push someone to the edge via imagination as a ler then it is to attempt to have yourself pushed to the edge as a lee).
I feel like I have typed up a lot, though. So I shall go sleep now because I have work in 8 hours. We should really set up a group chat for those interested.