not sure if this is a new 4.x feature of express.. but you can specify multiple search paths via something like...
app.set 'views', ["#{__dirname}/views", 'views']
however, this does NOT jive with express-partials...
TypeError: Path must be a string. Received [ '/node/coffeecup-test/views', 'views' ]
I've noticed particularly with layout files, but I would assume using an array in set "views" breaks various things.