Simple example script showing how to add more menu options to the Transform component in Unity.

ContextMenuExtensions.cs

using UnityEngine;
using UnityEditor;

public class ContexMenuExtensions : Editor
{
    [MenuItem("CONTEXT/Transform/IncrementXScaleBy1")]
    static void IncrementXScaleBy1(MenuCommand command)
    {
        Transform t = (Transform)command.context;
        Vector3 tScale = t.localScale;
        tScale.x += 1;
        Undo.RecordObject((Object)t, "TransformXScale"); // Record changes to allow Undo.
        t.localScale = tScale;
    }

    [MenuItem("CONTEXT/Transform/IncrementPositionBy1")]
    static void IncrementYPositionBy1(MenuCommand command)
    {
        Transform t = (Transform)command.context;
        Vector3 tPos = t.position;
        tPos.y += 1;
        Undo.RecordObject((Object)t, "TransformYPosition"); // Record changes to allow Undo.
        t.position = tPos;
    }
}