I use a lot the "Keyer Interface" in portable activity. As I do not have a comfortable paddle to travel (should be fixed soon

I struggle a lot with the "ESC" key. My reflex when I want to stop to send a message is to hit this key and then it stops the message but it also deletes the callsign of my contact.
I kow I should use CTRL+A instead, but I have the reflex to hit "ESC" and it looks difficult to change this.
Any chance to change the "ESC" behaviour or customize it to "only stop" the message and not delete everything ?
Sorry If I missed something in the user manual, I tried to find this feature with no success.
Best Regards,
Patrice