Editing Conferences default PIN timeout

This is how FreePBX is generating the conference room in the extentions_additional.conf, especially line defining PIN input:

exten => 1000,n(READPIN),Read(PIN,enter-conf-pin-number,)

Currently I need to change this time from default value to some specific value, so I am manually editing these lines every time after the asx reconfiguration and GUI reload, and after that I do reload manually over CLI.

Is there a posibility to add a GUI element (dropdown, number input, …) so to be able to edit timeout for PIN input?