I am glad to communicate you we have just finished developing a new question type based on the shortanswer one.
From our point of view, this question type attends to one of the most important and basic parts of the structural analysis. It allows the professor to ask the student to draw the graph of internal forces of a predefined structure.
At the moment we have just developed it for moodle 2.2. But we will be interested in developing it for moodle 2.4 as our university moodle version it is going to change next year.
I upload a .zip with all the information. We have tested it and we have not found any problem. But we will be very thankful if anyone checks it (as we are not moodle experts).
Note: We have also developed a users guide with the explanations of how to work with this question type. Available here: http://dfiles.eu/files/2swkyfnfk
The question and its components are open-souce and free.