In any case, my vote is now yes for 4.
Assuming that your rule simply refers to the scaling of class abilities that run on a fixed level progression (such as the Marshal's major aura bonus) and so on, as opposed to a blanket ban on everything not spelled out on a table, my vote for 3 becomes yes.
Let it be known, however, that my vote for 12 follows my vote for 9 logically as a no. There is a difference between codpiece of armor +2 and a +2 codpiece, that being that the former actually does use the MIC enhancement guidelines for applying armor, natural armor and deflection bonii to unusual items (which doesn't change per this ruling either way), and the latter applies a new rule which allows you to treat a striped sweater as masterwork, and then enchant it as you would a chain shirt (which is changing), which means that you could have a +5 slick striped sweater of invulnerability, shadow, silent moves, acid resistance and arrow catching (using SRD enhancements only) because your striped sweater is technically now "armor". Congratulations: your striped sweater magically makes you Waldo (and also grants damage reduction and stuff).
It gets even more absurd if you can wear clothing with your armor (and why wouldn't you wear at least undergarments to keep your armor from smelling bad?), because you now have a +5 armor of various enhancements for your actual Armor Class value, and a +1 speedo of various other enhancements for the things you couldn't tack onto your first armor without turning it epic.
I'll vote on the others later.