I'd love for there to be a way to mass associate contacts with a company.
Here's a great example. I just got ahold of a company roster and uploaded it into HubSpot. (This is just one branch of a large/common company, so they don't have a unique domain and couldn't associate in the upload.) I had HubSpot create a list of contacts during the upload. Went to mass edit the contacts, couldn't edit Associated Company. Then I tried to create a workflow doing the same thing, and got suck with not being able to edit/set a contact or company property that would associate the contact with that specific company.