I think it's probably okay that quitting apps isn't that obvious; under most circumstances you don't need to quit iOS apps. Only very specific kinds of activities are allowed to run in the background; when you switch away from an app and don't switch back to it, it's going to be force quit by the system when it needs resources. Managing iOS apps like desktop apps is kind of an anti-pattern.

I agree about point #1, but I'm also not sure how to make copy/paste particularly obvious with touch. To be fair it's not really obvious with a mouse or other external pointing device -- it's something we just have to learn.