Metadata access in Filesystem

I'd love to access comments, tags and the other stuff that is displayed in Wuala (accessed how many times...) via Filesystem integration.

An example:
I own the file "Example.txt"

In FSI I would see:
Example.txt (write access)
Example.txt.comments (not sure if readonly or write access, write access would be nice but then I could change other comments - maybe a commentXX file for each comment would be better but this could bean that it's getting quite cluttered)
Example.txt.tags (write access) <-- 18+ flag should be a tag too, so you can flag files. Maybe even allow 12+, 14+, 16+... flags as well since not everything is 18+ but still not suited for minors, like certain games
Example.txt.info (readonly) <-- stuff like "Accessed 1337 times, 42 Comments..."

I think "Example.txt.thumbnail" or something like this already exists? I'm not sure if it's for folder icons only, though...