Hi Benedek,
Note that mouse tracking works only in Open Minno, because it is difficult to send to the old server the amount of data saved in each trial of mouse tracking.
We just finished building a mouse-tracking study in Open Minno.
We ran some tests to make sure that the data is saved properly, but I suggest you do some more tests before you use it.
Here are the study files. The mouse tracking task is called rate.js.
Best,
Mayan & Michael