Some questions about Shadowsocks configuration

[mintydev789]

I have a basic shadowsocks-rust server set up with this config file:

{
    "server": "0.0.0.0",
    "server_port": 443,
    "password": "...",
    "method": "...",
    "mode": "tcp_and_udp"
}

I then connect to it from both my Android phone (shadowsocks-android) and Linux computer (shadowsocks-rust) using the server's IP address, port and password. On my phone I also have remote DNS with 8.8.8.8. I have a couple questions that I've not found the answers to anywhere:

1. Is it normal to use the same connection (same password and everything) on every device, or am I supposed to have different configurations for every device? If it's the latter, how do I set that up?
2. How does DNS work over Shadowsocks? Do DNS requests also run through the proxy, being hidden from the ISP? If it doesn't work like that by default, am I supposed to set it up myself with local-dns?
3. What does the remote DNS feature on Android do, and is it possible to set it up on Linux too?
4. Is there a recommended client for iPhone? (I know that's not relevant to this repo, but I don't know where else to ask)
5. Is "mode": "tcp_and_udp" all I need to support both protocols? On the Linux side I use the -U flag with sslocal, and I don't have anything set up on Android, so I'm not sure it supports UDP.
6. Should I bother with IPv6 at all? I haven't done anything with it so far.