Roll dough into a 12-inch x 18-inch rectangle.
Brush with melted butter.
Sprinkle with filling mixture.
Beginning with the long side, roll dough jellyroll-style.
With a serrated knife, slice into 1-1¼ inch rolls.
Spray an 8-inch x 12-inch pan with cooking spray.
Pour rum syrup into the bottom of the pan.
Sprinkle with pecans.
Lay rolls on top of pecans.
Cover with plastic wrap and let rise in a warm place until doubled in bulk, about 1-1½ hours.
While buns are rising, heat oven to 350℉/177℃.
Bake buns for 25 minutes, or until golden brown and cooked through.
Remove from oven and turn out onto serving tray.