Couldn't reproduce this on SpiffoSpace, but it's kinda hard to gather so many Zeds behind your car without admin, got scratched many times and was forced to hurry before I die.
I did some further "testing" and drove from Muldraugh up to the mall and back to West Point main road, no problems so far (ping is from 130-200), didn't experience the bug where ghostzombies scratch me and car is warping back, only thing I noticed is, driving across the Railroad bridge from West Point over to the mall side is pretty much suicide for the car. Was crashing pretty much constantly with nothing in front of me.
Action bar was removed for inventory transfer, because they were generally exceptionally very quick and with smaller items, it would cause the username to jiggle in multiplayer, which proved to annoy quite a few people. So it was disabled.