To brew a smoked porter, your gonna need some smoked malt, either rausch malt or smoke your own (which is what I do). To do that is going to require at the least a mini-mash. You really don't want to use that liquid smoke.
Some brewers use peated malt, but I say yeck to that too...
I wouldn't use fruit in a porter (or any other beer for that matter..save a flanders or other lambic style). I would either make blackberry cobler, mead or wine with those.
A person who knows everything, knows nothing...