Ok, so let me get my thought on each of those aspects out of my system.
1) The Gamelist is a bit of a tricky aspect. Salvation has a pretty good one which YgoPro can use as a base, DevPro has a horrible one that makes the screen look like a rainbow. There's only 1 minor problem, to make something like this happen, AKA a Gamelist that doesn't use YgoPro's engine, Percy would have to develop a launcher. Not happening.
2) No, no, no and no! I'm a dirty casual and I think that's a stupid idea. Not to mention we already have this sort of discussion 2 months ago.
3) AM said everything there is to say about this one.
4) YOU want YgoPro to ask you about activating a card in EVERY possible activation window? That's one of the stupidest ideas I ever saw on this Forum and that's saying a lot.
5) Eye candy isn't always good. I'm actually glad that Percy focused more on the gameplay and less on the eye candy. This alone made YgoPro much less buggy and less crashable than DevPro and Salvation combined. Some things can be done to improve the looks of YgoPro Percy, but lets not go overboard with it.
6) Let's make 1 thing clear, The banlist, card scripts, etc. are located on an online server, the files you have on your device are used of offline/LAN play ONLY! I'm guessing you want a login-only server for competitive play, oh wait, there's already one.
It's not a stupid idea, it was an option. Personally the bigger issue is inconsistent hot keys, why we have checkboxes to do 1 thing and buttons/hotkeys that can do another thing. Either united the system or it just looks sloppy.
I'm not for 100% on anything, it's called mentioning possibilities.
#6: This INCLUDES a beta server that has all the unofficial updates, but keeps everything around Percy, without having to worry about LAN. Also the CCG Server project that is being discussed; appending that to the list of servers would suit alot of casuals who like that type of thing. You couldn't be more wrong on the context of the poll, has nothing to do with ranked or logins.
#4: Not as stupid for having a checkbox vs a hotkey for manually placing vs unchecking and checking a box every damn time.
#5: People have requested SIMPLE Opponent sleeves for a long time. There is acceptable eye-candy and winmoar Eye-candy, like Animations, Avatars, and UI changes to the system.
#2: Apparently you aren't a dirty enough casual, because it's a pretty requested feature and duel notes do jack spit vs actually requesting against specific decks.
#1: There are 2 ways to make the gamelist look nicer. 1 is the actual launcher + hardcoded, which is frowned on by Percy and is not even remotely a priority. The OTHER option is for the gamelist data to be parsed via an API or some system so a developer and put the gamelist on a website or 3rd party launcher without Percy needing to do any additional work.