Hi avatar, can you explain me why you return 500 instead 402 ?
" * Changed the way we block requests. We now return "500 Request Blocked" for most of the blocked requests. "
And just my suggestion, in my oppinion, use our own AdBlock list always much much better than AdBlock Plus...
My answer is yes, I had a Flash Block script that work reliable and made by a user from your country :)
Here it is: http://userscripts.org:8080/scripts/show/46673
Or here is an older version of it: http://tny.cz/849f7c06
Modified version but seem lack of built-in excude feature...