I regularly am editing, creating eg. new blocks in another CAD window. When I return to the main drawing, the new elements do not appear in the Library Browser, unless I exit and re-enter LibreCAD. This is quite a bit of work, particularly when creating a lot of new blocks and wanting to try them out one by one.
Would it be difficult to add either
Another possibility, though not very elegant, would be to copy/paste blocks between CAD windows.
It's not trivial to implement this feature.
The current way is clearly efficient, because it only process the library folders once.