When you activate a send to a reverb in the “sends” section of the inspector, you are able to right click on the send and a menu comes up with “Edit Effect Reverb XYZ”, allowing you to quickly edit that send effect.
This feature is missing from the direct routing pane in the inspector. If you use direct routing to a group that has a reverb on it, you should be able to access that group via a right-click menu.