It is a two handed weapon so i think yes. That it is a double weapon shouldent make any difference.
Also you have time to correct the spelling mistake in the title.
Edit: and you did.
It seems that, according to the description of the feat you only need to use a) two-handed weapon b) full-attack with it. So I agree with Darling, you can use it with dire flail.
so far as im aware RAI is that double weapons while connected at a shaft as supposed to be more or less treated as 2 individual weapons but i could certainly be wrong