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A lot of those can be handled with the -New Tag- option under the Properties button of the weapon although the Special tag is broad enough to cover all of that. If you look at the Lance, for instance, it has the Special tag, and in the description of the weapon it mentions the special rules about disadvantage if you're within 5 feet. However, there is no scripting attached to any of that. Returning and Hidden are really just the same as the Special tag in my mind, but if you want a new tag the mechanism to add one is there.
The undersized one is a bit rough though, you might want to play with the weapon size field in a script and define it as a magic item - like adamantine or silvered are defined as magical and you apply these "properties" to a weapon.
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