I'm reviving this thread since I found no answer and the bug I thought was related to my problem was resolved but I still can't configure the authentication for proxy servers, so at my work I'm only able to use the browser, since it does the authentication everytime I open it.

I don't know if I understood correctly, but the bug I posted above was about the development enviroment, not the actual device. Is it even possible? I'm really confused here...