you can use any sugar to up your abv. if you are after flavor as well plain brown sugar is not a good bet. that flavor is molasses as Steve says, you are better off adding molasses directly for that flavor.
I brew a wheat wine with coconut sugar (Jaggary?) and in high enough doses I get decent flavor from that. But that is like 4 lbs in 5 gallons so alot.
maple syrup in sufficient quantities adds a nice flavor note but again you have to use a lot.