Hi ulrik, you can accomplish this with existing functionality:
Option 1: Apply to a sequence of photos in "batch"
1) Caption the first photo of the sequence
2) Right-click, 'Metadata (IPTC) Snapshot' -> 'Take'
3) Select the target set of images (the rest of the sequence)
4) Right-click, 'Metadata (IPTC) Snapshot' -> 'Paste'
Option 2: Apply to a sequence of photos individually
1) Caption the first photo of the sequence
2) CTRL-SHIFT-C to copy metadata
3) CTRL-N to save and advance to the next photo in the sequence
4) CTRL-SHIFT-V to paste metadata
5) CTRL-N to save and advance to the next photo of the sequence
Both of these approaches have served me well on deadline. I prefer Option 2, because my hands don't have to leave the keyboard, and I can visually confirm each photo I want to receive the copied metadata.