Search notes:

~/.config/xfce4/terminal/accels.scm

Use ctrl+c and ctrl-v for copy/paste (but then requires ctrl+shift+c to stop a program/send SIGINT) 
(gtk_accel_path "<Actions>/terminal-window/copy"  "<Primary>c")
(gtk_accel_path "<Actions>/terminal-window/paste" "<Primary>v")

See also

terminalrc

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