I think your wants are reasonable, and probably coming down the road here pretty soon--probably in the next couple of major revisions.I use split view all the time (and slide over for the apps that haven't implemented split view yet grr...) but if we ever see floating windows on an iPad then Apple has really jumped the shark. What I hope they're focusing on is drag and drop between apps in split view mode as well as allowing two instances of the same app side by side.
My main wishes have come down to this: 1) Open up core audio support for developers. 2) I still need a couple of apps to add either Dropbox or iCloud support (or better yet, both!) so that I can get files from them easier. The first one is on Apple, the second one is on developers. If you don't have some kind of sharing support at this point, you're kind of clueles, IMO.