Example for how to create stacked settings

ComponentCode

public class SettingsComponent : IComponent
{
    public CombinedSettings Settings;

    public float Speed { get { return Settings.GetFloat("Speed"); } }
}

public class CombinedSettings
{
    private readonly List<Settings> _settingsList = new List<Settings>();

    public void AddSettings(Settings settings)
    {
        _settingsList.Add(settings);
    }

    public float GetFloat(string key)
    {
        return _settingsList
            .Where(settings => settings.HasValue(key))
            .Sum(settings => settings.GetValue<float>(key));
    }

    public void UpdateTime(float timePassed)
    {
        foreach (var settings in _settingsList)
        {
            settings.DecreaseTime(timePassed);
        }
        _settingsList.RemoveAll(x => !x.HasTimeLeft);
    }
}

public class Settings
{
    private float _timeLeft;
    private readonly Dictionary<string, object> _settings = new Dictionary<string, object>();

    public bool HasTimeLeft { get { return _timeLeft > 0; } }

    public Settings SetTimeLeft(float timeLeft)
    {
        _timeLeft = timeLeft;
        return this;
    }

    public Settings AddSetting(string key, object value)
    {
        _settings.Add(key, value);
        return this;
    }

    public void DecreaseTime(float timePassed)
    {
        _timeLeft -= timePassed;
    }

    public T GetValue<T>(string key)
    {
        return (T)_settings[key];
    }

    public bool HasValue(string key)
    {
        return _settings.ContainsKey(key);
    }
}

Usage

// Add settings
var settings = _pool.CreateEntity().settings.Settings;

settings.AddSettings(new Settings()
    .SetTimeLeft(10f)
    .AddSetting("Speed", 5)
    .AddSetting("Damage", 8));
settings.AddSettings(new Settings()
    .SetTimeLeft(4)
    .AddSetting("Danger", 11)
    .AddSetting("Damage", 122));


// in some settings update system
settings.UpdateTime(Time.deltaTime);


// Use settings
var bulletSpeed = settings.GetFloat("Speed"); // will be 5
var damage = settings.GetFloat("Damage"); // will be 20