It is currently difficult to select all the contents of a cluster without selecting the cluster itself, on the front panel or a block diagram. This is especially true if the contents are themselves clusters or arrays; a marquee selection often picks just a few elements from them. I suggest having a command on a cluster's right-click menu called "Select all cluster contents" that does exactly that. Alternatively, or in addition, this could be a shortcut such as Ctrl+Shift+A (to match the existing Ctrl+A for selecting everything on a front panel or block diagram).
An example situation where this is useful is when you place a TypeDef constant on the block diagram, and want to show the labels on each element of the cluster, to help you fill in the values.
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