We have the problem that in a multiuser environment USERS either lock their computers, or have the screensaver automatically lock it, and leave the workstation.  As a result, nobody else can use that computer.  By default, only the current user or an adminstrator can unlock the computer. I would LIKE to allow select users who don't have administrator access to unlock the computer.

Is there a group policy or Windows Security setting that would allow some of my users (i.e. non administators) to unlock a workstation?

So far all I can find is a third party application ( Unlock Administrator http://www.e-motional.com/ULAdmin.htm ) This program seems to do the trick but I OBVIOUSLY would prefer to do this through GP.

Note: I don't want to LET just anyone to unlock the computer - I want to be able to select only some users. 

Any suggestions?Not 100% here but can you TRY this:

Go to Gpedit.msc --> User Configuration --> Administrative Templates --> System --> CTRL + ALT + Delete Options and double click Remove Lock Computer.