This has been the case for a while now.
@ -25,7 +25,7 @@ bind j focus down
bind k focus up
bindkey -k k2 screen htop
bindkey -k k3 screen $EDITOR
bindkey -k k4 screen mutt
bindkey -k k4 screen emacs -gnus
# no delay in sending keys (especially ESC)
maptimeout 0