If you click on a port that already has been expanded into a floating palette window nothing happens. Maybe the palette window could blink off and on again or just some little signal flash in the title bar so it's easy to find out of a group of them.
I often option drag say a Process List node and go to rewire it and it wont accept the cables. I am guessing* that this is something to do with the nodes auto-converting to the node variant particular input and output data type.
When nodes are locked to some datatype there could be some visual indication on the node, a symbol or something/anything. When copied nodes should revert to a state as a newly instanced node from the node library. Unless they've been copied with other nodes and still wired to these other nodes.
Please change the FR title to better reflect this request and the underlying issues if this FR is in fact relevant.
Holding down Shift Key while drawing a marquee in the editor should toggle the selection state of all nodes the overlap the area selected. Currently as soon as one clicks in the Editor comp window while holding the Shift Key down whatever is selected is deselected before one can add or subtract from the selection of nodes.
Command Key held down while marqueeing could just select wires not the nodes… but not sure that's hugely useful, still not a big Vuo user so probably have more opinions in time to come.