This only makes sense if the user has the ability to browse and manually select recommended packages. Built in application manager doesn't show recommended dependencies at all (at least I've never seen any) and fapman shows dependencies but doesn't offer the ability to select recommended packages. Don't know if other application managers offer this functionality (I've read that aptitude is available, this app would offer the possibility to select recommended or proposed dependencies but is console-based therefore not a solution for the average user as well as apt-get or dpkg on commandline).