I didn't put extra points in the skill Mindreading!
I find Mindreading worth the XP dept!
I even didn't play on the "hard" difficulty, but on easy and normal it's for sure not necessary to reach the most highest level to survive to the end!
I played the first time (on easy) and doing ALL the mindreadings and reached almsot level 36!
And I didn't put points in Wisdom. Also I didn't make use of the "Creature" via Crystal Skull!