QR support is too heavy to add
Not necessarily. DAVDroid would only need to register for those “URL types”, then any QR Code reader should list it in its “open-with” dialog.
Several Firefox extensions generate a QRCode from whatever is in the address bar or from the clipboard.
Or even on right-clicking a link (“Create Barcode from Link” entry in the context menu with the “Mobile Barcoder” extension).
This would indeed save quite some time!
Definitely! Especially considering we still have to remove/re-create our accounts whenever a calendar/addressbook/… was added
OTOH, one could simply scan those barcodes with a QR reader, and copy the URL to the clipboard to then paste it to DAVDroid. Still easier than typing.