Greetings!
First off, I am glad you like the Karma! I know you had a lot of questions and concerns before buying. I hope that those have been answered for you.
Let's see... I cannot comment on all of your items, but...
1) I am surprised that part of the instructions did not tell you to put the Karma into recovery mode. That is a required step.
2) In theory, the Karma should only charge when it sees that it needs to. Otherwise it will turn off the charging circuit to extend battery life.
3) Where to post wishlist items... Hmm... I would guess riovolution is really the official place, but this board is probably far faster and with far less noise.
4) I wish! There were some folks begging for a press/hold on the menu button to toggle shuffle. Add your voice here!
5) I cannot comment because I avoid the site due to the sheer volume of noise.