There is no way to direct your creature. He should be more helpful and aggressive with a ranger or mage head, though. I just automatically used a warrior head, up until the beginning of the fjords. I was trying to get up another level before heading to sentinel island (had 4k experience left to get to level 18), and the only opponents left in the beginning section of the fjords were level 21 imps. After multiple attempts at a group when my creature had a Rush Attack / Fatality level 6 head, I found it much easier after I switched to a Fireball level 2 ranger head (didn't have a Magic Missile / Magic Blast mage head at the time).