Academic PDF Reader Proposal

I need a PDF reader for literature reviews with the following capabilities:

Critical: 

•  Allow me to comment and highlight 

•  Allow me to search comments and highlighted text for all documents in an associated folder/iCloud directory 

•  Allow me to assign Citation information for the document

Ideally, but not critical: 

•  Allow me to one-click copy correct citation information into Author. 

•  Be compatible with Liquid | Author

What do you think, would it be useful for you as well?…

(just a thought)