1)It's been forever since I have used the legacy interface, so I google'd it it went away in 7.3, which was 2+ years ago, so it seems you may be on a very very

1)It's been forever since I have used the legacy interface, so I google'd it it went away in 7.3, which was 2+ years ago, so it seems you may be on a very very old version of Unifi US. I'm running 9.5.18, and I can confirm that option no longer exists (or is needed) 1) Also on the current version, to remove a DHCP client you can click on Client Devices / DHCP, and remove there. I just tested that as well. 2) Gateway traffic by individual client, ip, zone, etc works fine, in my experience, but I am also using Policy Engines, which I don't believe is supported on the version you are using. Policy engines can apply QoS, security, or routing to any object - ip, subnet, any sort of logical grouping. 3) I agree that it used to have a lot of problems with re-adopting, but it's been a while since I have seen that - the only time I ever see a re-adopting screen is after a OS re-install. 4) Network ACLs where replaced with policy again, but again, that's pretty new - you may be running a old version.