Ok. All those are messing with your sense of sight by giving bonuses to concealment. The skill though is worded as evading detection by sight. To counter this, try smell or hearing. Chuck Kroot hounds in, heightened senses of smell would set them off barking to put the place in lock down. That or you rely on the disruption he causes moving around. While you cannot perceive him directly, the power doesn't say he avoids any impact on the world, he isn't incorporeal. So gravel or sand, even some crisps or something around a base, watch for footprints or crunching gravel appearing without a clear identifier of source and fire at will.
Rules to hand now, surely things like Weapon Jinx can only target things if he knows they are there surely? He needs to know the machine is there to disrupt. Having a read through, white noise is being the utter swine since it messes with psychic or technological detection. The original rules for Dark heresy powers seem to be written in a system where the only enemies in the area were humans, heretics and low level aliens without much in the way of a gun. Probably not till later did it include Xenos, and I don't believe that Imperium psychic powers can make a total mockery of all alien technology irrespective of origin. For example try using White Noise psychic disruption to stop an Eldar Warlock seeing you with it and he'll likely just look at you and laugh before blowing your head off. Tau technology is effectively better than empire counterparts in many ways. Xenos technology should surely have some better resistance to something like this, it's perhaps a little more reliable or at least technologically sound compared to Imp stuff. To this end I would still argue that things like drone senses or laser detection should still apply or to a lesser degree. This is not about static jamming the signal which sonar or radar probably could, this is a physical break in a laser beam which is interpret as something crossing it and should not be affected.
For wall walk, have you considered spikes? :-) Serious note though, energy barriers or fields might harm him for trying or stop him gripping it. That or make the building design really annoying, it says he has to stop to go from wall to ceiling and vice versa.
Edited by Calgor Grim, 04 February 2014 - 12:53 PM.