Emmanuel, the problem with splitting a curved wall is that is doesn't retain it's form. When I split a half circle I get two half circles next to each other while I expected to still have the half circle but now in two parts. Is that one of the bugs you were referring to?
I didn't know the ctrl-key "trick" so I tried it. Using your described method I managed to create a circle wall starting with a 90° part and continuing with using the Ctrl key to add 90° parts until you have a full circle. That seems to work perfectly although you have to move the mouse to weird places to reach 90°, sometimes very far from the wall
This might be considered another bug. The mouse move should work like when you curve an existing wall using the marker in the middle of the wall. Drawing 90° parts seems to me a better method than what you described with splitting 180° walls. It works without copy-paste or splitting and the wall parts remain joined. It's definitely a better way then the copy-paste-coordinates system I described in my previous post.
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