You've got muddled up. the 'Out of memory' error means there's not enough RAM, not flash memory. Redirecting the Flash1 writing would only allow us to use the memory stick as a cache. Don't forget though, that the browser has a 2mb cache limit anyway, so the entire thing would be pointless.
And yes, it would be nearly impossible. It would mean coding a PRX that intercepts the advertisment and hides it. This would actually take up quite a bit of memory, because there would have to be a database from which the blacklist is loaded; loading them on-the-fly would be pointless as it would mean comparing each animation or flash image that os loaded being compared to the blacklist every time it loads. The only other alternative is to store the list in the memory, which would completely contradict the idea of the hack (to get rid of the errors).
There's also the problem of when to block the image (before or after the download, before being nearly impossible), and then what to do instead of displaying the image.
Anyway, ad blockers are bad! Do you have any idea how much money webmasters lose if you use them? For instance, Robert A's takings are reduced by about 14% thanks to ad blocking software, and none of the ads he displays on his sites are nuisances. They're all very relative and useful ones. Do us all a favor,
turn it off! 