Allowing a free style to RP with no actual stat system and starter limitations comes with its shackles too. A person can already start their characters with basically a higher standard of strength then the majority of other RP sites if not all of them. The only thing to stop the confusion and the possibilities of overpowered characters is withholding the three main issues. One, Haki, two, Logia, and three, Mythical zoan hybrid forms. The site is still more free then basically any other OP site I've seen (that isn't a rip off from this site) all that's asked is limitations so every character can become a strong character, but not a godly character.
As for your current ideas, everyonehasarmorhakiwhat? Then what is the point of having logia transformations? A useless secondary ability that does nothing to anyone but selected NPC's? Will the site become an arena of armor haki users because we want to allow Logia and Mythical Zoans to go into their desired state? I semi-understand the mythical zoan idea, not really, but it's better if we leave this part of the site limited and at the same time free with what they have. I mean, seriously, logia users that transform into their elements but it's more cosmetic then anything? (basically), to me, I'd think the site would only lose quality. Not to mention the major change will have to effect everyone ICly, as in all of the yonku and shichibukai, all the marines, pirates, everyone. And Armor haki will just be something we give out as charity? WHAT THE HELL KIND OF CANON IS THAT! I personally don't like it, both quality wise, and plot hazard wise.