Thanks for the recommendation. I already tried it. Yes there is an option for slowing down the game. The bad thing about this that it slows the whole game down.
I had the same problem in Fallout 2 but Killap s R P 1.2 has solved the encounter problem withouth slowing down the game. I remember playing fallout 1 in my first computer and it was not easy to travel from a place to another which was pretty enjoyful. Now I travel with almost light speed and between 2 very distant locations I only encounter one or two events...