Add to Unity the possibility to PLAY with just F6 and PAUSA with F7. Just download the script and put inside the "Editor" folder.

ShortCutKeys.cs

namespace Arj2D
{
    public class ShortCutKeys
    {
        private const string MENU_EXTRA_RUN = "Edit/Extra/Run _F6";
        private const string MENU_EXTRA_PAUSE = "Edit/Extra/Run _F7";

        [MenuItem(MENU_EXTRA_RUN)]
        private static void Run()
        {
            EditorApplication.isPlaying = true;
        }

        [MenuItem(MENU_EXTRA_RUN, true)]
        private static bool CanRun()
        {
            return !EditorApplication.isPlaying;
        }

        [MenuItem(MENU_EXTRA_PAUSE)]
        private static void Pause()
        {
            EditorApplication.isPaused = !EditorApplication.isPaused;
        }
    }
}