I don't think this is possible to do. You will need to create another custom curtain Wall that would fit properly in those situations. Or script one so you can set them parametrically.
You can make a wish for this feature, we can vote on it and if it gets enough support, we can submit it to Graphisoft for consideration.
If you do make a wish, please post its link in this thread.
Loving Archicad since 1995 - Find Archicad Tips at x.com/laszlonagy
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