The update of december 2016 makes some approvement on show related tables in a popup. It would be really helpful if you can choose an attribute from the related table instead of the ID's. It is possible to sort on an attribute from the related table. I think it is a small step to add the possibility to choose an attribute to show instead of the ID's (they are all the same of course).
Yes that would great!
You could configure the value (limitedly) by setting up the configuring the table pop-up in the web map:
result:
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