My point was that they may already have the permissions to view them, and can look up whatever they want themselves. Are the handout permissions for the rules set to All Players in the view section? You may already know, but that is the original form of getting info to players on Roll20. Handouts are the original compendium (if linked so you can navigate through them). I run a system that has been out of print since the mid '90s and my players can look anything up by going to the table of contents handout, or some of the top tier handouts I have in folders. Pretty much the entire system is there, and they have the permission to view them all. If I want to draw their attention to something specific, I can click "Show to Players" to make it pop up for everyone. It isn't in the compendium tab, but there is nothing keeping your players from using it if the permissions are set up right.