1. Navigate to the tile you want to change and press menu button on remote. You can then swap that tile for any other app.
2. Rii MX3-M. It has IR functionality so can control Q5/Q10 Pro on/off. The airmouse works really well, most buttons are mapped correctly, and it has a functional (if basic) keyboard. It's also relatively inexpensive. We sell it here: http://www.futeko.com/products/AC111.php