If a True/False question is created using the Moodle UI, penalty factor of 1.0 is assigned to the question.
If a True/False question is created using a text file (GIFT format), penalty factor of 0.1 is assigned to the question.
In both cases the value of the penalty factor cannot be set and/or modified by the user.
I propose two changes:
1) Penalty factor for imported T/F questions should be set to 1.0.
2) Users should be given the possibility to change the penalty factor as with any other question type?both when creating the question in Moodle and when editing the question.