I never use a scent from a vehicle so the problem is not so obvious. Anyway, walking sometimes I get stressed. Every two minutes two creatures appear and hunting them with VIP requires a minimum of 40 seconds for each of them. You must be still not only because of the risk of them disappearing, but also because it is very dangerous to walk while watching a screen. Therefore, when you finish hunting the second dino you have between 30 and 40 seconds to go fast or the next turn there will be only one dinosaur. If you find an obstacle, a traffic light or you just can not walk fast enough, you will have lost a creature. I think this should be reviewed.
Anyway now it is less important since the incubators of 6 hours have stopped giving aromas of 20 minutes or claws and only very very very occasionally give a 5 minute aroma. Possibly this change has been the worst of this version although I can understand it for commercial reasons.