I'm missing code completion with respect to phpdoc tags like @return and @param.
I guess code completion within comments in general is undesirable but in this particular case it's quite handy.
I'm using Zend Framework a lot and class names become a bit long ...
p.s. I guess there are more phpdoc properties (@var, @property, @link, @uses ...) which could use this auto completion feature, these two are the most used I guess ...