Well, I've played police pursuit mod some time ago and the stop sticks are already implemented there. If ppm can do it, lcpdfr should definitely be able to do that. It was rather simple and sometimes difficult but fun nonetheless. You could request stop sticks by pushing a button, a countdown began and when it had ended, you could get out of your car and deploy them. That's where the difficult part was. You had to guess where the suspect would drive.
Since lcpdfr is much more realistic than ppm, it should definitely be possible.
And as far as the roablock goes, I agree with unr3al. It may or may not be used in real life, it would be fun nonetheless.