Is there a "fast travel" feature in the Witcher (enhanced edition)? I could not find any by clicking on the map, but it would be really useful sometimes.
There is no fast travel in the Witcher, even in the enhanced edition.
Yes, there is some sort of although heavily limited. Without spoilering: At least for some time you can use Places of Power to get back to a house in the city. Furthermore you can later use several teleporter places throughout the world although you can only travel from one teleporter to the other.