More efficient metadata...yes, like Avid.
Make the metadata work more like Avid.
1. Allow for batch entering of clip info for metadata fields. Example, say I have 12 files. I want to label al with Scene 2. I can update all 12 files at once to scene 2 and not individually.
Say you have a sub clip of a file that already has metadata, it automatically brings in all of that clip data with it. Also, if you update either the sub clip or the source of that sub clip the metadata is linked. So if you update it in one, it updates it is all that reference that clip. It could be a default, and then the user has the opportunity to break that link too.
be able to copy paste rows of metadata from one clip to the next.
for multicam sequences and sequences if there is metadata, custom or otherwise there is an option to have that copied to the multicam clip or sequence. This would be useful if one has already entered in metadata for source material and wants the same metadata available in the multicam clip.

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Brandt Ryan commented
As for batch editing, this is already possible. Select all relevant clips in project panel, and in metadata panel you'll see in some fields "Multiple Values", e.g. the Name of the clip. Just put scene number in scene field, and presto, all the selected clips are now updated with the scene number.
For the subclip issue -- I also wish there was an option for every instance of a subclip to maintain metadata or original subclip. E.g. - I'm using the productions feature - and I have a project with all of my subclips. I have another project called Scene 01, which only contains 1 sequence. When I pull all of the subclips I need into my Scene01 project, all of the metadata is wiped, I suppose, because it is a new "instance". I spent countless hours inputting metadata, and now it's of no use. I might have a workaround of "duplicating" the subclips into my Scene1 project, but that might defeat the purpose of using the Production feature. Or likely, I'm misunderstanding something?