Hey there @Mike_Smith, welcome to the Discourse!
The devs have acknowledge many times that the fence system needs improvement. I believe that @sdee mentioned a few streams ago that a click and drag system similar to walls was one of the potential options. As for corner pieces, your best option at the moment would be @TomMartow’s end pieces mod:
I don’t think you need to worry about that. This game started off as a pet project for the co-founders Tom and Tony, who quit their jobs in Silicon Valley to start work on this (back in 2012). Once they felt they had made enough progress, it launched on Kickstarter in 2013. They have been working ever since, and have added on new devs along the way (Stephanie, Albert, Chris, Yang, Linda), and show no signs of slowing down 
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