This situation happens to me all the time - cars stopping far into the crosswalk as I'm crossing the street. When this happens, I usually make eye contact with the driver to make sure they see me. Sometimes I'll even get vicious and raise my eyebrows at them to communicate that, as a pedestrian, I'm unsure that they will stop in time. This is true. The next part is not.
If I don't get the response I like, I tend to turn into a ninja - you know, flip out and kill people. I once killed everyone on a bus that stopped too far into a crosswalk. That'll make them think twice about riding a bus that stops too far into a crosswalk.
/end nonsensification