From my point of view I prefer to have more options to modify an object in contextual menu than to have 3 (or more) pretty the same furniture.
Maybe in property file to have predefined few variants and in modify furniture to chose which to display. In my case 0;45;90 degrees open.
Also for modify the cutoff in Your case.
Now is about 1000 furniture on official and at least 1000 unofficial which are used for most of us. To have 4~6000 in the library I don't think is useful.
Is only an opinion.