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So this came up last night and I made an in the moment ruling on it intending to look it up later. Having been up and down the rules a bit I can't find a definitive answer.

If a spell has a range of touch but doesn't require an attack roll (such as Vampiric Touch) then is it affected by mirror image?
In the moment I ruled yes because it seemed to make common sense. Whether or not you need to roll to hit, if you need to touch a creature to deliver the spell then it seems like there would be a chance you touch a mirror image instead and not the creature?

Vampiric touch (and I assume other similar spells) doesn't have the attack trait. Mirror image uses the word 'attack' quite a lot in the description and references rolls to hit when it mentions images getting destroyed but doesn't specifically mention effects with the attack trait. So it could be read either way.
My instinct says that RAW probably mirror image doesn't work against those sorts of spells, but that does seem to run contrary to common sense. If you have to touch someone to deliver it then logically you might grab an image instead.

Anyone know of a specific rule that clears it up or have thoughts on how they'd run it?

I'm interested to know how people ran (or are planning to run) the taking of the man's promise, specifically with regards to the fog cloud spells that are (per the text) supposed to be in effect for the entire battle aboard the man's promise.

Obviously for the scripted events (Harrigan being ambushed, the Rahadoumi officers escaping) the fog clears for a moment to reveal them and I'm fine with that but the rest of the fight seems very difficult to run. The PC's opportunity to shoot at the sailors as they approach seems impossible as all their targets have total concealment so they wouldn't know to shoot them. The same goes for the Rahadoumi sailors firing down from the sterncastle once the PC's have boarded.

More critically it makes just getting on to the MP problematic. Any grapple attempt is subject to the 50% miss chance and jumping across is essentially tantamount to throwing yourself into space with no clue where you're going to land.

This problem is compounded for our group since I have two primary casters and a gunslinger (who aren't going to be able to do much ranged damage through total concealment) and the only melee presence is a rogue who essentially has to do the whole fight without sneak attack since everyone has concealment. Finally since the group is pretty new running their first 'big' fight with everyone having some degree of concealment I think will complicate things enough to confuse everyone and slow what should be a fantastic fight down to a crawl.

I think I might have the fog clouds only affect areas forward of the aft deck so it can still part dramatically to reveal Harrigan and the escaping Rahadoumi but leave the PC's to fight in the clear. The other option is to have it be a different kind of fog cloud that creates a flat concealment to everyone in the AoE rather than total concealment at >5ft but I think I'll do the former since as I said it's new players first big proper fight so I want to give them a chance to shine.

As I said at the top I'm interested as to how others ran this or are planning to run it and whether they think the above is a good idea or have any better ones?