[Using Sakai] Global change in Gradebook

[Alan Wylie]

Hi,
I have a colleague who is using Sakai 2.4 running quizzes in the  
Tasks, Test and Surveys. One of the quizzes is worth 100 points but  
this need to be recalculated to be worth 20%. In the Gradebook there  
is a global change, however when we have tried to enter a formula or a  
(/ 5) we get a dialogue box instruction to enter a numeral. It would  
appear that we can only add or subtract numbers that will then change  
all the quiz results (360 students) of that quiz. Can you let us know  
if there is a way to make a global change outside exporting to Excel  
running a recalculation then reimport to Sakai?

Cheers,
Alan Wylie.