Lightroom :: Checkbox Setting For How To Import Keywords

I just duplicated a bunch keywords upon importing a month worth of photos from a remote project.   I assume this is because LR has no idea how to handle them other than importing them in a flattened state.  I suggest a checkbox that tells LR whether or not to look for an existing keyword of the same spelling in its structures before creating another one.  If it then finds multiples, it would be easy enough for it to figure out the correct keyword based on context.
 
I have many nested keywords and have found the nesting to be pretty much useless in the real world, but it is a great organizational tool.   It allows about the same grouping functionality as collections but without the messy accumulation of collection names that were only used once.