Hello Tim, Pierre and Joseph,
I think that maybe we can look at this issue again given the work done by Jamie Pratt for the combined question type (see https://github.com/jamiepratt/moodle-qtype_combined ).
Could multianswer use exactly the same "combinable" API created by Jamie ?
I don't really know the answer but I am quite sure at least part of it apply to multianswer too.
My plan is:
- verify that I can make Joseph's regexp combinable (this will also helps me to get a better grip on Jamie's API)
- next summer I will try to use the same API for multianswer.
Of course someone could object that maybe this is a waste of time given how much friendly is creating a combined question compared to creating a multianswer question. But multianswer is in core and, I think, will stay here in the near future.