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Tadario - I keep books, comics, journals, and media in a separate libraries. For me at least, the custom columns I have for each is too disparate to consider having them in the same physical library - even with Virtual Libraries and Managed Views.
Like theducks, I use a separate Intake library. For books I do whatever it takes to get the ISBN, Authors and Title 100% correct. Similarly for the other libraries - get the essential data right first. Before I do the Copy to Library step I use the
Find library duplicates function of the
Find Duplicates plugin to weed out any duplicates.
I also find it useful to have Test libraries in which to experiment. And for similar reasons I keep a recent version of Calibre Portable on hand. Not sure if the equivalent can be done on OS/X or Linux as easily as it can on Windows.
Aside - the Copy to Library function can be added to the main, or any other Toolbar via Preferences->Toolbars, i.e. you are not forced to use the context menu, it just happens to be there by default, along with a bunch of other things which can also popped into an iron toolbar.
BR