I know it's a small pain, but I've opted to require the user to type `using Gtk; using Gtk.GConstants` if they want all of the constants in their local environment (or `include GConstants: A, B, C`). I don't really want to pollute the user's workspace with 300+ variables since that greatly increases the chance of a symbol conflict (same reason that I have `Gtk.ShortNames` and `Gtk.GAccessors` in their own areas -- although `G_` will soon get an easier solution).