Connection Angle - as above for the Angle between End-Points.
Drag Distance - controls how far you can move the cursor (in pixels) before XTrkCad considers the action to be a drag instead of a click.
Drag Timeout - controls how long you can hold a mouse button down (in milliseconds) before XTrkCad considers the action to be a drag instead of a click.
Auto Pan - if enabled, dragging near the edge of the Main Canvas will cause the Canvas to move to follow the mouse.
List Labels - controls the format of titles for Turnouts and Structures displayed in lists (such as the Parts List).
Maximum Track Grade - Tracks with more than this grade are drawn in the Exceptional color.
Train Update Delay - number of milliseconds between updates in the Train Simulation mode. A lower value will generate a smoother display but reduce system responsiveness.