i have to admit i'm finding it quite frustrating how many classic KDE ui things are being sacrificed for homogeneity recently - single click to open, mouse over program menu category to switch, now this
double click by default in particular was abandoning an iconic and way more intuitive way to interact with the desktop to be more like what windows and mac users are used to, which is a shame
edit: jumped the gun here, doesn't look like it's the new default. rest of my whining applies tho