Action hooks on product data tabs.
It would be nice if there were action hooks on each product data tab. These could be used to add specific instructions to users about each tab.
Some have hooks, but others do not.
For example: The attribute tab. Users currently have to save a post after adding attributes in order for them to appear in the variations tab. I want to add a nice little paragraph explaining that to users, but there is currently not a hook to do so.
I always put little 'notes' on certain places via CSS using :after and content. This way you can be very specific about the place it appears (until classes and id names change on the next major release ^^).