1. In many cases (e.g. during creating the relationships) the end date is the same as the start one. It would be useful to have a button "Copy" near the fields of start date for fast copy it to the end one (instead of fill three fields).
Also originally requested, but already requested elsewhere:
2. More general issue. When we create a series of of similar relationships (e.g. works-recordings, when all 12 recordings have the same date), it would be very useful to have a function to copy the date in a temporary buffer and next past it to all 12*2=24 sets of fields, instead of fill manually the same date into 3*2*12=72 fields.