Is it possible to place windows with keyboard shortcuts in Gnome-Shell?
Install gconf-editor.
sudo apt-get install gconf-editor
Now, run gconf-editor ( Alt+F2 gconf-editor)
Go to apps/metacity/window_keybindings and edit the move_to_center / move_to_corner entries to your liking. (see screenshot:)
You can use Ctrl + Super + any of the arrow keys.
Try the Put Windows GNOME Shell extension, which claims to be a fully customizable replacement for the Compiz Put plugin.