My suggestion would be to include a way to see what the default values are for inputs to a sub VI easily. This could either be implemented in the way shown below through the hover over tool tip, or by the context help window. Either way, it would solve the problem of seeing what they are and whether one needs to place a constant there or not. Currently it takes a few clicks and wasted time adding a constant to the diagram and deleting it if is a default value which is sufficient.
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Duplicate of http://forums.ni.com/t5/LabVIEW-Idea-Exchange/Show-the-default-value-of-controls-in-subVIs-which-are...