How to disable touchpad when mouse is connected and how to rebind mouse buttons?

General system Newbie
12

@bytehowl
Here is a ‘recalculated’ version (skip to Edit2):

#!/bin/sh
journalctl -f -p 6 | awk '/idVendor=046d|disconnect/ { system ("ydotool key 530:1 530:0") }'

find a unique string in journal when your mouse is plugged in /switched on and disconnected by this command:
journalctl -f -p 6
The customized script may be autostarted.
Static query is below at Edit2
It seems a bit over-engineered.

Edit2
For me the RTFM is pretty valid.
/usr/include/linux/input-event-codes.h
So having configured ydotool we also have touchpad on (531) and off (532) keycodes. Let’s wipe down the ‘white-board’ and simplify the case.
I inserted 2 scripts into Autostart a login and a logout one
cat momp.sh

#!/bin/sh
# Check whether mouse is plugged-in and disable/enable touchpad
while :
do
    lsusb | grep -q Mouse
    MOUSE="$?"
    if [ "$MOUSE" != "$PREM" ]; then
     case $MOUSE in
      0)
       ydotool key 532:1 532:0
       ;;
      1)
       ydotool key 531:1 531:0
       ;;
     esac
     PREM="$MOUSE"
   fi
    sleep 5
done

and before logout:

cat mompend.sh

#!/bin/sh
pkill momp.sh