duck

///// The MonoBehaviour:

using UnityEngine;
using System.Collections;
using System.Collections.Generic;


public class MyMonoBehaviour : MonoBehaviour
{
    public enum MyEnum { ValueA, ValueB, ValueC };

    private Dictionary<MyEnum, bool> m_MyEnumToggles = new Dictionary<MyEnum, bool> ();

    public bool m_MyBool;
    public string m_MyString;

    public bool GetEnumToggle (MyEnum key)
    {
        if (!m_MyEnumToggles.ContainsKey (key))
        {
            return false;
        }

        return m_MyEnumToggles[key];
    }

    public void SetEnumToggle (MyEnum key, bool value)
    {
        m_MyEnumToggles[key] = value;
    }
}



///// The editor:

using UnityEngine;
using UnityEditor;
using System;

[CustomEditor (typeof (MyMonoBehaviour))]
public class MyEditor : Editor
{
    void OnInspectorGUI ()
    {
        MyMonoBehaviour myMonoBehaviour = target as MyMonoBehaviour;
        if (myMonoBehaviour == null)
        {
            GUILayout.Label ("No target");
            return;
        }

        foreach (int i in Enum.GetValues (typeof (MyMonoBehaviour.MyEnum)))
        {
            myMonoBehaviour.SetEnumToggle ((MyMonoBehaviour.MyEnum)i, EditorGUILayout.Toggle (Enum.GetName (typeof (MyMonoBehaviour.MyEnum), i), myMonoBehaviour.GetEnumToggle ((MyMonoBehaviour.MyEnum)i)));
        }

        DrawDefaultInspector ();
    }
}