Pet active attack skills (not healing or buff skills) can be configured to automatically activate as soon as the cool down timer has reached zero. To enable this feature drag the skill of interest (see also: tweaking the level of a skill on a hot-key bar) to the summoned creature hot-key bar. Then right click on the icon for that attack skill in that hot-key bar. The icon glows to indicate it is enable for auto attack. Right click a second time to deactivate auto attack. This works only for active attack skills and will not work for healing or buff spells.