Hi Christopher,
Thank you for the fast reply. Digging through the interface I found the options you mention, but then I guess it would be convenient to have those options
on the dialog shown below:
I also realized something weird which prevented me from finding the ignore/un-ignore button, Scanner apparently sometimes isn't able to poll the S.M.A.R.T. counters for those drives,
so the "Show S.M.A.R.T." option isn't always present (at the moment of this writing it is, so I was able to ignore the warnings).
However, while running HD Tune Pro v.5.00 I could see said counters while the option was still missing from Scanner.
Unfortunately the drives are past their guarantee so I can't RMA them, but the data on them is safely backed up.