The SHR Clone mod allows (except for level 7) Lisa in the car-and Lisa as you are playing. It's a wacked
out parallel universe. The plot's still the same, but the car's aren't and the missions tell you to rush! Try it out................REMEMBER TO READ THE README......

Download here.

If you want to do some hacking of your own game, download Lucas's tweak at
http://lucasstuff.com/.