As far as I know the QUIZ does NOT accept decimal grades, period. I have tested this on the most recent 1.5.4+ and 1.6.2+ codes, and still behave the same. It is not clearly stated so in the Help button of maxgrade (maxgrade.html).
We fixed this by detecting whether the instructor put in a decimal number in the grade (of quiz), and send out a error message. Attached please find the temporarily solution that we implemented. However, for now, it will NOT detect / give out a warning message when you put in something like (3,3), (3..3), (3;3), which I'm hoping that someone in the moodle community could help get this fixed...
You could do a diff of the attached code with the current editlib.php to see the differences, or just search "change" for the changes that we made. Thanks!
Gradebook
decimal grades
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