Thanks for the feedback. Re: PAC, this is unfortunate 
I’ve opened issue (#3516) on our tracker to add support for this.
Re: no_proxy formatting, this has also been reported in this post, we’re working on a fix - issue (#3514)
As for providing UI for setting proxy configuration… I’ve opened an issue for that too. Ideally it will display the values that have been auto-detected and allow you to override them.