As a preliminary, does LR 5 care what lenses I am shooting with to make perspective correction? If so, where is that information entered?
Yes, and it simply gets it from the EXIF data - ie information recorded in the photo by the camera.
Also, I understand the difference between a Managed Library and Referenced Library. For a hobbyist who doesn't shoot much, which is preferable. (hint -- I'm running an older iMac with only 6Gb of RAM.)
You're thinking about another program - Lightroom always uses regular Finder folders.
Look up Julieanne Kost's free videos on Adobe's site.