Not a great app for textbooks

I primarily use my ebooks as an alternative to carrying a textbook. To this end, the OS X version is lacking in features that would make it better as a study tool:
1. Lacks multi-color highlighting (underlining) which is available in the ios version and other e-readers
2. lacks the ability to edit bookmarks (both location and text)

3hairs about Kindle Classic, v1.10.6