I propose a $timeout variant that takes only a duration parameter.

There are two primary use cases I can think of

It would be really nice to be able to do:

$timeout(100).then(function(){
    // do stuff here, this runs a digest if it needs to which the
    // $timeout(function()... variant does not since 19b6b34
})

As well as

myServiceFn().then(function(res){
    // do something
    return $timeout(300);
}).then(function(){...

Which is rather common and today is accomplished by return $timeout(angular.noop, 300) which feels redundant and rather ugly.

This could be accomplished by adding a simple check here and I wouldn't mind creating a PR if you would entertain one.