Perhaps. I'm not familiar with the particular exploit, so perhaps I'm missing what it is trying to fix. I'll change my stance from disapproved to Neutral for the time being.
That's fair.
Both work just fine. I'll be mentioning them again, below, along with everything else new to the first post.
I think it's a combination of Magic Vestment working on ordinary clothing and AC-providing magical clothing such as Robe of the Archmagi. I am fairly certain there is no rule related to putting armor enhancements on standard clothing.
I'll just skip the rules I'm neutral on.
Rule 017: Non-Floating Armour
Approved, and it was probably forgotten with the system change.
Rule 018: Claw, Stab Claw…and now with my other arm!
Approved, as long as we aren't considering slams (below). Attempting to claw or bite while holding something in that appendage doesn't make sense, unless they drop said item as a free action to make the attack.
Rule 019: All Slams Are Not Created Equally
Disapproved. A slam is much like an unarmed strike; something competent enough to have one in their stat block would be able to use them with their hands full. I could see not allowing a slam attack from an arm strapped into a tower shield, for example, but it should not be difficult to smack someone in the head with your arm even if it is holding a longsword.
Rule 021: Enchanting Enhanced Projectiles
Approved.
Rule 025: Lava Is Easily Resisted
Approved, and a much more sensible interaction.
Rule 027: Don't Penalize the Prestigeous
Approved, as this is another rule that seems to have mistakenly vanished on the edition change.
Rule 028: Qualified and Disqualified
Disapproved. This is kind of unusual rule in general, but the specific wording (the ability to meet a prerequisite or requirement through temporary means) means that, for example, any character could take anything with Evasion as a prerequisite because they have the ability to acquire it through a Ring of Evasion, even if they don't have the ring.
There is also the problem of any spell which grants capabilities, even for one round, grants entry into a prestige class. A human could enter Beholder Mage at first level, because they have the ability to be affected by Polymorph and change into a beholder for a few rounds.
There is also the big question of what class abilities (speaking of prestige classes) are "dependent" on the specific feat.
Rule 31: Nobody Notices the Guy with the Tower Shield
Approved.
Rule 032: Full Attack and Attacks of Opportunity
Approved. I'm not so sure it is a clarification as much as a house rule, but I doubt anyone intented the archer receiving 4x power attacks just for attacking.
I'm a bit on the fence about this. On the one hand, some situations (Paladin + Crusader, Monk + Ninja) were clearly not intended to stack.
On the other hand, we have situations like Fist of the Forest + Deepwarden. This combination is clearly supposed to stack, as FotF grants the CON bonus as natural armor, while Deepwarden replaces DEX with CON for AC purposes.
Saying that it doesn't stack unless specifically permitted by the ability is unusual, as I know of no situation where this is specifically called out.