Hi John,
The Self-Monitoring, Analysis, and Reporting Technology, or S.M.A.R.T. (sometimes written as SMART), is a monitoring system for computer hard disks and can help indicate if your HDD's are liable to fail.
Whilst the theory is sound, in most cases there is no real need to enable the SMART function. If your hard-disk is going to fail due to wear and tear you will usually get plenty of warning and realise it's time to replace the HDD before it fails. If it fails due to an electronic component failing, it will happen suddenly and SMART technology generally doesn't pick this up.
So should you enable it? In my opinion it isn't worth it unless you are running a high-end server or monitoring lots of PC's in a work place environment.
Having read through the manual for your mobo however, I think it is academic as there seems to be no option in BIOS to enable it.
Hope this helps