Like others have said, I'd be cautious. Molasses has a very bitter flavor and can really turn a flavor profile in the wrong direction. We've played around with brown sugar and molasses in a few beers and wines (wines like banana bread and sweet potato), and have come to the conclusion that if you can taste it, it detracts from the wine (severely sometimes with an acrid flavor).
I'm all for experimentation, just remember that not all sugars are the same. Brown sugars are not fully refined so they have molasses in them, powdered sugar probably has an anti-caking agent added, and then there are non fermentable sugars like maltodextrin and lactose and many others. Do a quick search online before using anything other than cane sugar and you'll probably be fine.