There is nothing that is impossible when it comes to software configured environment.
As long as accessibility is available, the cockpit technology configurations can be manipulated in such a way that the intended behavior is subjected to extortion.
If a pilot has malicious intend and he/she is able to hide that from external comprehension, there is nothing that will stop him/her from manipulating cockpit controls to achieve a different goal than anticipated with a normal cockpit configuration.
WP