I haven't drafted so maybe I shouldn't opine, but my thoughts on the proposals are:
* I don't really like the idea of a trade phase because it expands your options, which is precisely what draft is not about in my opinion. Unless you open packs that really blow, you should have adequate material to build with.
* For the same reason, I think permitting people to just grab any NU Pokemon and mash it into their team (which is I believe what you're proposing?) also works against the purpose of the draft. People assume NU means "crap", but there are a lot of very workable NU Pokemon (Tauros e.g. seems pretty good to pull out of nowhere), and it gives access to a lot of "silver bullet" mons (Pory2 vs. the Intimidate dragons, Primeape vs. sleepers, etc.) which can invalidate people's first picks in a manner I would suggest is frustrating. If you take Breloom high only to see someone grab a NU Vital Spirit/Insomnia Pokemon out of nowhere and hose you, that seems like no fun. Compare to picking Breloom high only to run into a Sleep Talker- they had to spend a draft pick on a guy who Sleep Talks well, and you know that they did so and can reasonably plan around it.
* I don't have a very strong opinion on changing the ratios, although to my knowledge the OUs don't totally dominate the format. Given that, it seems more in character to leave the proportion of OUs smaller, as it encourages/forces people to try out mons they otherwise wouldn't play and rewards people for knowing or figuring out how to best make use of them. This is again similar to TCG drafts, where people look at things they would never otherwise use (Mindless Null e.g.) and have to evaluate their strength in the context of the environment, which is different from their strength in a void. And while we may never see any breakthroughs from it, I think it's a good way to get people thinking about alternatives to the usual suspects for OU play. It was only a few months ago that Roserade was UU, right? Now she's a top lead.
This is much more an issue of making things "interesting" and "fun" and "clever" rather than competitively balanced, but that's the point of drafting, right?