Some of our users end up with dozens of tasks assigned to them for a given project, and it would make sense for their views of their tasks to be sorted by the outline numbers (WBS equivalents as transferred from MS Project). This does not appear possible now, correct? If it is not possible, I'd like to propose this as a feature improvement.

Task number/WBS # is not yet included in the viewing schema and your suggestion would be a great entry for the Greenhouse.  This is a place to input your suggestion and have it scored for escalation to development. 

 Sorry, but I can't find the Greenhouse you refer to. The link provided takes me to my home tab.

 How does one get the the "Greenhouse"?  I would like to enter some ideas there.

It is just an additional tab at the top.  I have asked the admin to look into why you can not see it and will let you know via followup post. 

I guess the Greenhouse is still under beta so it is limited access, with the final version being opened up to all users in April.  I have asked to have you added which should be comeplete by the time I post this comment.