For now, when you try to use some namespaced class it will add a fully qualified name (of course if there is no use statement already)
Example:

We have a class NS\Test\MyClass;

$myClass = new MyCl[ctrl+space] -> \NS\Test\MyClass()

It will be cool to have an availability to insert a short name + generate use "in 1 click". Because now we have to insert full name, then remove namespace portion, click [alt+enter] and choose "generate use".
Example:

$myClass = new MyCl[ctrl+space] -> \NS\Test\MyClass() OR MyClass() + generate use NS\Test\Myclass;