I sent the following via feedback, fyi:

When clicking 'Add marriage information' from the Family view pages, the url generated is:
http://trees.ancestry.com/pt/EditPerson.aspx?pid=-XXXXXX&...

When it should actually be:
http://trees.ancestry.com/pt/Event.aspx?tid=XXXXX&pid=-X...

Also currently, adding a spouse does NOT add a marriage event, AND when attempting to add a marriage event, it will not be added if all 3 information fields are blank even though a selection button for the current spouse is checked. (A work-around is to add 'unk' or something in the Location or Description fields, if a date is unknown)

My suggestion would be to have the proper marriage event boxes display immediately after adding a spouse, so that a marriage (or some sort of union) is registered for the couple.

No union causes major problems in the otherwise excellent (imo) Gedcom Export.