Bah, did some more testing of various games with the new setting...
Even though I thought making this change looks better; tried "Alien Breed" and had lots of visible tearing when set to "1:2" as opposed to "1:1".
This occurred with games that scroll horizontally and vertically; but when moving vertically e.g. Alien Breed, Arnie 2 and Blood Money.
Looks like it's a no go then; shame really
