In order to be able to rotate the wedges properly, you need to be in build mode..
If you are building on a planet, use the build block and just enter it using R. That way, you can build similarly to when you\'re in a ship and press Space. Then hold left ctrl and you will see options pop up on the top right of the screen. There will be symmetry tools and so on.. If you have the wedge selected in your hot bar, there will be an option saying: \"orientation\" or something like that where you can rotate the block by clicking the arrows on the sides...
It\'s a little odd and I hope they make it like minecraft but either way works good for me :D
hope I could help :P