Comment 16 for bug 164903

You referred to standard PC keyboards, not to standard IBM PC keyboards, although I admit that an IBM terminal is not a PC.
I said nowhere that this bug was specific to gedit. The controller part of X11 UI is notoriously inconsistent: pressing Ctrl+Delete means "delete the next word" in Nautilus but "Delete to the end of line" in Firefox, and Ctrl+K works nowhere except in Emacs, to my great disappointment. (It works in KDE but I have GNOME here.) And what I should expect from pressing the middle mouse button remains a mystery to me; I cannot figure it out from the behaviour, except for the simplest case when text has just been marked in the same application, and I cannot find any relevant guide. (I think there must be something in developers' documentation I do not have any reason to read.) Therefore I do not think you can invalidate this issue on conformance grounds.