Before, the only way to select a skill was to click on it in the bottom rows that contain all available skills. Four most important skills can be selected with keys, but the rest had to be manually clicked every time, in order to use it on map. This could be unintuitive and tiring as you had to move between map and skill menu all the time.

Now, with new skill context menu, you can right click on any place on the map and see all the available skills for a given tile. Mouse remains on game map, so selecting and targeting skills is quick and easy.