What is the smart value for the most recently added value in a multi select dropdown?

[Patrick Cartier]

I've poured over the documentation on smart values in general and smart value lists, but can't seem to find anything.

I can see how to get the first or last value from the multi select dropdown, but I can't seem to find how to get the most recently added value. First or last value is dependent on the order of values in the admin settings for the list, if ordered alphabetically then first just pulls the the "highest ranking" value starting with A.

I'm looking to use this to set the value for another field. 

Please help! There must be a way and maybe I am overlooking something simpler!

[Nic Brough -Adaptavist-]

That's the current trend in web site logins.

I'm not fond of it either.  (Then again, I'm not fond of username/password at all.  Although if we must, id/tab/pass/secondary-partial-pass/enter is definitely better)