I have two suggestions.
1) there might be a way to do this, but I haven't found it in preferences or the menu. I'd like that when I open the Evernote program/window, that it open to the list of notebooks rather than the list of notes.
2) I absolutely hate the fact that Evernote tries to find the boundaries of something I'm trying to take a picture of, then takes the picture automatically, often distorting the shape of the thing. I wanted to keep a notebook log of artwork I've created, but there's no direct way of getting good photos into Evernote. I have to take a photo, then drag and drop it into Evernote. I suggest making the 'smart' feature of the Evernote camera optional, so that people who want to use it for documents and receipts and don't care about distortion can still do that, but that it can be turned off and used as a regular camera that the user fully controls.