Years ago I filed a similar wishlist against GTK 1 and I think I even submitted a patch. It was rejected, but they said they would consider it if I used a keyboard modifier instead of an alternative button, but I never got around to rewriting my patch. <https://bugzilla.gnome.org/show_bug.cgi?id=67649> also hints that using a modifier to reverse direction might be accepted.
I've posted my comment here instead of upstream, because I've been told it's useless to post comments to closed bugs. -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
