The subsoiler is no problem,,,,,,,,,,,,mostly clay in my area,,,,,,,,,the bigger rocks will shear the pin,,,,it is impressive on the tractor,,,,I use it more for loosening up bumps and humps so that I can scoop them up with the bucket. Last week I used the plow to do the loosening,,,seems to work even better to get the soil in condition to move with the bucket. The 3rd function if I understand your question correctly is on the joy stick and a after market installation. Not sure what kind as the dealer installed it for me. Ummmmm,,I wanted a M7040 but I would have to sell the farm to get one,,,,,,so it was a catch 22!!
I will investigate the limbinator,,,thanks!!