3) Correct me If I am wrong, but wouldn't a run button make the game more aggressive? I feel rushdown is already difficult to deal with. NRS does not seem to be fond of zoning which is probably why they gave everyone armor. I feel like a good fighting game should have defensive options. I don't see the run button promoting this.
I know this is off-topic, but...
Well, Kabal, Kitana, Sindel, Skarlet, Mileena and Liu Kang have instant fireballs, which are obviously thought for zoning purposes. Noob Saibot has 50/50 zoning (I have no idea why a faster unduckable meterless overhead gives pushback on block and his slower low projectile doesn't, but that's a whole diff. rant). Sub-zero controls space (zone) with his ice clones and ice beam. Jax has a cancellable unblockable ground pound, and his projectile recovers hella fast, even faster than Sonya's. Shang Tsung's juggle starters are safe on block and even give you frame advantage. Reptile has a slow and a fast forceball, which are primarly zoning tools on top of his pretty-fast acid spit. Talking about Shang, he's also got his upskulls (in front, on top and behind), which give also frame advantage, just like Sektors. Sektor pushes you back with his strings which open up his zoning game. The other 2 robots also control space with their bombs (which cover the ground, encouraging jumping) and have anti-air tools. Kano and Ermac are both obvious zoners as well.
The other part of the roster are primarly anti-zoners (though some of the characters mentioned above can use their zoning as counter-zoning as well) like Raiden, Nightwolf or Smoke. Leaving just some special cases left on the board with a what-the-fuck-are-they-intended-to-be etiquette ? (baraka, jade, sheeva, etc)
I'd say that MK9 is a zoning-orientated game, and that's probably the reason why they gave so much armor all over the game through patches and stuff while the game started it's evolution. Plus, it's not easy armor at all. Either it's a big "miss and you get full combo'ed" (Kabal's), last shortly (sonya's) or is buggy (JC's red kick). Let's not forget tha if you get hit by the first active frame of your armor you'll lose the meter and no EX attack will come out.
It's just NRS lack of planification over patches that may make it look like it's not a zoning-orianted at first, but give it a deeper thought.
On topic:
Given the characters' original design, I'd say that the run button does help counter zoning in this game.