abiword works just fine without gnome support, but the ebuild forces it. I would suggest ebuilds for abiword-gnome and abiword (no gnome support).
The ebuild does not force it. Have you read any of the documentation about Gentoo? Please refer to the USE howto here: http://www.gentoo.org/doc/use-howto.html Once you read that, you'll see that gnome and kde are not being pulled in to most of your bugs. The only one I can not argue with is the gdk-pixbuf one you have.