Hi c-major
Yes, changing the name may make things clearer to users.
Automatic Project Merge
I agree that the current setup does work , provided that the template has enough placeholders to accommodate the number of clips on the timeline. However any grouped clips on the timeline are split (even if they total the length of the placeholder and excess clips are pushed in (it seems) anywhere.
Here's the result in merging single Placeholder .vpj file with a timeline containing two image clips (Not grouped in this case.....)

The first image is placed in the holder but second is split and inserted some way further on.
This is the Placeholder .vpj file used for this example.....

There is only a single Placeholder here. (they are thumbnails) But the "merge result above shows that something is wrong since I would have expected just the first image to have been inserted seeing that there was no place for the the second.
But my main observation was that If the vpj file to be merged has no placeholders then it deletes the timeline and all you get is that .vpj file. As I mentioned there ought to be a proper Merge Project that will place the the merging file in a particular position in the open timeline.
Nat