Options - General

Features

Turns features on/off.
Off means they don’t show up in the interface.

Access Control

You can exclude files from displaying in your library.

An option for those egoist who wish to keep their XXX stuff for themselves

Access Control - JRiver Wiki

Connected Media

Allows you to integrated internet resources like YouTube in JRIver.

Data support

Allows you to integrate documentation with your audio.

Explorer

Browsing and managing files on computers just like using Win Explorer.

FTP upload

Send files over the internet using FTP.

Image Support

Browse and manage images

Incomplete Shutdown Dialog

Probably a warning dialog when JRiver was forced to stop due to a Windows shutdown while active.

iPhone support

Unclear what is does.

http://yabb.jriver.com/interact/index.php?topic=71488.0

Linkable columns

Linkable columns are explained here.

Links Bar

Links to websites.

A great way to get additional information.

Retrieving cover art from the internet is one example.

Media Network

Media Network is discussed here

Notes

Text information.

Notes - JRiver WIki

Party Mode

Party Mode - JRiver Wiki

Podcast

Allows you to listen to podcast in JRiver.

Podcast Settings - JRiver Wiki

Quick Play

Quick Play is a menu of all tree items, accessible even when the tree is hidden.

Quick Play - JRiver Wiki

Recent Playing Nows

Removes the Recent Playing Nows from the Playlist.

Remote Control

Toggle the Remote option in the Options panel.

Shows Start in Tree

Start shows the start screen.

Split View

Split the main pain in maximum 3 different panes

Split View - JRiver Wiki

Theater View

Toggles Theater View in the View menu

TV

Toggles Television in the general options.

Video Support

Toggles Video in the tree.

General Settings - JRiver Wiki