I think that got traded off for the ability to edit the path in the addressbar before activating the destination.
So now we have to finish it off with [Enter], whether or nor we edit the list item.
I'm sure nikos had a reason for inhibiting filepane activation after click-to-select, but it adds a keystroke more often than it saves anything.
BTW, Did you notice the r-click drop-down history lists for each individual filepane pathbar? They
operate as you would expect: pane is activated with click.