Just a quick mod I threw together to help line up interface objects. You can drag the lines around with the mouse after you create them.
Slash commands are:
/leu or /lineemup or you can just use /line
/leu x -- Creates a x plane line.
/leu y -- Creates a y plane line.
/leu clear -- Clears all lines.
/leu clear x -- Clears all x plane lines.
/leu clear y -- Clears all y plane lines.
/leu clear <linename> -- Clears the line... /leu clear leu1 -- clears LeU1 line.
/leu move <linename> <%> -- Moves the line to the specified place..
/leu move leu1 33 -- moves line 1 to 33% from either bottom or left side.
/leu save -- saves line positions between sessions
/leu restore -- restores the saved line locations
/leu pixel -- Toggles pixel showing on and off on the tooltip.