For your second question read this post from @Fox ,
maybe its what you need. Its in Russian, but you can
use translator. There is an example script too >
Proxies not working.
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Hi, i tried to load proxies into BAS, through txt in format ip:port:user:pass and even manually by filling the boxes in proxy edit, and nothing works? I tried 2 different proxy providers, checked them with different applications and they work, but in BAS they cant connect no matter what...

If i do it like on the above picture, it should work, right?
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Ipv6?