"I have looked at the variables available and can not see that it is possible."- Unfortunately you are correct, it is not possible currently.Q: Has anyone made this work or developed a module to make something like this work ?A: I'm not aware of any mod currently that allows to do so, but if I remember correctly I think a complete history variable or at least some improvements in that direction are planned for 1.10 (currently in beta / do not use in productive environments)