Hi, so copy-paste/blueprinting works out-of-the-box now, but doesn't copy channel settings which makes building out e.g. a large transport network on a separate channel difficult. Anything that can be done (or another mod that helps with this)?

i noticed the same thing. adding

local function save_blueprint_data(blueprint, mapping)
    for i, entity in pairs(mapping) do
        if entity.valid then
            local channel = get_channel(entity)
            if channel > 0  then
                blueprint.set_blueprint_entity_tag(i, 'channel', channel)
            end
        end
    end
end

-- saving to copy-paste tool & cut-paste tool
script.on_event(defines.events.on_player_setup_blueprint, function(event)
    local player = game.players[event.player_index]

    local cursor = player.cursor_stack
    if cursor and cursor.valid_for_read and cursor.type == 'blueprint' then
        save_blueprint_data(cursor, event.mapping.get())
    else
        global.blueprint_mappings[player.index] = event.mapping.get()
    end
end)

-- saving to regular blueprint
script.on_event(defines.events.on_player_configured_blueprint, function(event)
    local player = game.players[event.player_index]
    if (global.blueprint_mappings == nil) then
      return --invalid
    end
    local mapping = global.blueprint_mappings[player.index]
    local cursor = player.cursor_stack

    if cursor and cursor.valid_for_read and cursor.type == 'blueprint' and mapping and #mapping == cursor.get_blueprint_entity_count() then
        save_blueprint_data(cursor, mapping)
    end
    global.blueprint_mappings[player.index] = nil
end)

local function on_built(event)
    local tags = event.tags
    local channel = tags and tags.channel or 0
    if channel > 0  then
        set_channel(event.created_entity, channel)
    end
end

script.on_event(defines.events.on_built_entity, on_built)
script.on_event(defines.events.on_robot_built_entity, on_built)

at the end of control.lua will fix that.