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@martensitingale i have used xfce4-terminal for years and never had that problem... but also i never have used tmux, im an old dog, i still use gnu screen
everything you mention works fine except it's alt-backspace to delete words.
Also if you want to dive in to the problem, i think readline is the one actually making all that stuff, since it works the same in python, mpsyt, etc., everything using readline. So my guess would be tmux is trying to make something different?
@maop FWIW it's the ZLE that's relevant here, not GNU readline
my goal is: ctrl+left/right for word-based nav; ctrl+delete/backspace for word-based bw and fw deletion, C-S-backspace and C-S-delete for bw and fw rest-of-line deletion. home/end for rest-of-line movement. backspace and delete for their regular actions. ctrl+z and ctrl+shift+z for undo/redo. so far this all works in zsh+urxvt but breaks if tmux or mosh are interposed (but not if ssh is interposed!)