Currently, one has to manually pull in all associated -dev and -doc
packages when installing something, if they wish to have these present.
What I would propose, is adding a facility to apt-get and friends that would
allow automagical installation of these associated packages without resorting
to relying on "recommends" and "suggested" packages (which would also pull in
other, likely unwanted, packages). A way to read all installed packages and
pull any existing -dev and -doc packages for them would be welcome as well.

Of course, seperate handling of each of these (-dev and -doc) would be best,
if this were implemented at all.


Example:
apt-get --get-doc --get-dev install foo
 Installing packages: foo foo-doc foo-dev
 Recommended packages to be ignored: foo-bar
.... and so on.