Lots of the newer electrics do have speed readings and can be set up to limit speed. I think they would be good on IC lifts as well but I have not seen any on them. The new IC lifts are programmable and speed should not be as big an issue. Speed is definately a problem but imposing a one speed limit such as 5mph when the operator does not know how fast they are going does little to help in my opinion. You must find a way to quantify what a certain speed looks and feels like to get the point across (fast walk) and even that is difficult. Playing with the engine speed can cause all types of other issues so I don't recommed that unless a dealer for that brand of lift does the work.