Yeah but if the crim really wants the motor, your bro then runs the risk of having his house broken into what with all the serious consequences that can have (for both him and the crim) in terms of terror and violence etc. I'm not saying people shouldn't have the right to protect their property, but a bit of common sense is needed in these circumstances. I leave my keys visible near the front door for this reason. I'm not getting hurt (or hurting someone else) over a six grand nissan.
That is if they realise the ECU is missing in the first place
In regards to the keys being visible, in my opinion, if they want it, they have to fight me for it.