If a particular compose sequence strikes you as sensible and suitable for everyone, you can submit patches upstream as well. I believe the base tables reside in

If a particular compose sequence strikes you as sensible and suitable for everyone, you can submit patches upstream as well. I believe the base tables reside in Xorg, and GTK uses these as an upstream source, but I'm not completely sure. I've did this for vowels with macrons — ā (-a), ō (-o), ū (-u), in particular because they are useful in romanised Japanese.