1. The bundle includes both a pump gas (91/93) and e30... Trust me e30 is incredible and easier to mix than you might think...
2. Yes, you can "safely" run a Stage 2, your ECU will cut things back if it it has to due to temps, but you're right, in the winter your charge temps will be low and you probably won't be racing on a track, right, so no biggie..
3. I changed my plugs to step colder at 12.5k on my '17, it does help some with upper RPM pull, less knock detected, but not a huge deal, but also at only $45 pre-gapped, it's a good idea. The plugs for my turbo Kia were over $100 for comparison..
Form:
1. Idle speed you want to keep at 850, I'd say... Strangely everyone talks about raising idle, I find you get less vibes keeping it down but a touch higher for response.
2. Ugh, hate rev hang, Stratified can't get rid of it on my tune, it's worse than my Dizzy with it ON... it's supposed to help but I'd say Off like you were thinking.
3. Oh yeah, long story short, Cobb uses ignition based, factory uses fuel and brakes. You WILL break loose in 2nd, I like Cobb with it set to 3, you get some spin but then comes back in check. You will always have to hit "ESC" off once to Sport mode to override factory to use the Cobb version.
4. Again, I suggest have Cobb enabled at 3. If you hate spinning at all, then 2, but you'll feel it kick in even more. The lower the number the sooner it kicks in and allows less spin.
5. Each tune supports 5 map settings you can change with your cruise control buttons: 1. will be Performance, 2. 15 psi max Eco/traction mode, and others can be Valet and Anti-theft where you would set it to that slot while parking and leave your car if someone tries to steal it it won't start. When you get back to your car first thing you do is change your map slot back to another and then start. I don't bother with it.
Hope that helps!