This tool lets you toggle the touchpad by pressing both the left and the right button at once.
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DISCLAIMER: I won't be liable for any harm done using this software.
Copy the latest release binary (or compile it yourself using the cross-compiler) to the reMarkable.
It should be in the home directory (at /home/root/touchToggler).
Copy the file touchToggler.service into /etc/systemd/system/.
SSH into the reMarkable.
Run chmod +x touchToggler.
Start it using systemctl start touchToggler and stop it using systemctl stop touchToggler.
To enable it on autostart run systemctl enable touchToggler. To revert this run systemctl disable touchToggler.