Hahaha, that's kinda funny . Yep, envoys should definately not trigger mines while immune. Diplomatic immunity should not shield you from damage but should make it so no one fires on you. Although, realistically, the envoy should trigger mines while invulnerable and take the damage anyways--but no one wants that  .

Actually, i think it should operate the other way round.

To my understanding, diplomatic immunity is supposed to represent an unseen negotiation with another faction, which agrees to not attack. It is not an actual technology of 'shield of invulnerability'.

Therefore, since mines are completely autonomous and not sentient, when triggered by an envoy, they should explode and cause damage even though the envoy is 'invulnerable'.

Not matter that you have diplomatic immunuty, you moved through a minefield and stepped in a mine, it's your fault if you fly off in little pieces.

It just makes more sense to me. 

Disabling/enabling OK, no problem. But selectively just for the envoy, i think it would be exploitable. Just pack some envoys together with your fleet so that the mines are disabled when the envoys goes near, and go through the mnefield to whip the enemy's @ss out.

I just think it makes more sense to make the Envoy not to be targetable by ships/structures, but it should still be damaged by mines if he goes headfirst on them. It's less exploitable.

Well, that's just my opinion, feel free to disagree.