Cycles through 'Merge' blending nodes.

• Select 'Merge' nodes.
• Tools -> Node Graph -> Blending mode+

• Cycles through 'Merge' blending nodes.

• Copy 'mergeBlendingDown' folder in your .Natron folder.
• Add following lines to your 'initGui.py' file, where <path> is the location of 'mergeBlendingDown' folder.

from <path>.mergeBlendingDown.mergeBlendingDown import *
NatronGui.natron.addMenuCommand('Tools/Other/Blending mode+','mergeBlendingDown', QtCore.Qt.Key.Key_Down, QtCore.Qt.KeyboardModifier)