It has been a month since I didn't used Gentoo. While my laptop waited for a replacement hardrive I've installed RedHat 8.0 on a old 2GB harddrive I managed to find. Although I missed the power of Gentoo, I confess that when I switch back I missed some features of RedHat. This is one of them. ZVT is totally broken for i18n and has design faults which make it dificult to fix. VTE is being considered by gnome developers as the most probable successor as the default terminal widget in gnome. The two attached ebuilds add support for gnome-terminal. Unfortunately this didn't workout quite as I expected - gnome-terminal becomes way sloooow with VTE enabled, even with antialiasing turned off and using bitmap fonts. (The version I tried is newer than the one shipped with RedHat, and I don't know if RedHat made special tweaks). Anyway, the work is done -- everything builds just fine and the use of VTE is controlled by an USE flag -- so sooner or later this may be useful.
Created attachment 4952 [details] vte-0.9.2.ebuild Remotely based on libzvt-2.0.1-r1.ebuild.
Created attachment 4953 [details] gnome-terminal-2.0.1-r1.ebuild Based on gnome-terminal-2.0.1.ebuild.
I stand correct: have GDK_USE_XFT=0 on /etc/X11/Sessions/Gnome is *not* exactly the same thing as disabling AA, as it has much consequences than that. So when called as GDK_USE_XFT=1 gnome-terminal it shows the same level of performance (i.e., slowness, but flexibility comes at a price) of the RedHat distribution. So I hope you find now these ebuilds worthy to make into portage.
vte is in the tree and the 2.1 snapshots at cvs.gentoo.org/~foser/ have gnome-terminal builds who only use vte.