This looks like a good spot to promote my very own kick-ass xcom apocalypse editors!
If you'd like to fix the useless road vehicles, try
roadwar, a tool that can make roads invulnerable, or at least very tough, along with a bunch of other tweaks like reducing air vehicle availability.
Links:
Strategycore
Xcomufo forums (needs registration, but since I can upload the files myself it tends to be slightly more up to date)
And if that's not enough you can do it yourself with the exe editor apoc'd. It also sports some savegame editing capabilities but won't beat XeD or Midnight there yet!
Links:
Strategycore
Xcomufo forums (same as above)
Have fun!