Understand, you simply like to use OSA.@Andy Ful,
Thank you, I always appreciate your kind and useful hints!
However I have noticed that I do not seem to have any need for running PowerShell Scripts, even at elevated integrity levels, except a few backup scripts of mine. For this reason I have come to the conclusion to use OSA to first block PowerShell scripts globally and then selectively whitelist only my backup scripts. This seems to be serving my needs pretty well (well, at least so far... ).
But as I mentioned, what is best for one, may not be the best solution for someone else.