I can help you with that but you will need 2 things, first is to download a script program called autohotkey, just google it, and you also need.. a popsicle.. lol or anything to hold your keyboard button down with. If you or anybody is interested, let me know, since i made a little loop script, i can share.
UPDATE: i made a script with the press of a button the character will do the "hump" back and forth infinitely and with a button to stop it, i changed it and don't need to hold the button anymore, have no idea if somebody already did something like this but here i am.
You will need to download and install AutoHotkey. Now go to desktop > right click > new > autohotkey script, a file will be created, right click it > edit script, a notepad will open, dont need to delete whats in by default, now copy and paste whats in the TXT file below into the script notepad and save it. To activate it just double click it, to exit it go to hidden icons and right click it > exit.
All the keys are in the TXT with the script and you can change them. Depth Sensitivity 55 recomended.
WARNING: when you activate the script it will be activated no matter where you are even if you are out of the game so beware.
Cheers.