I have tried this on my BRe, not because of leech twist but to stop the jib boom falling wherever it happens to be when the jib is furled. On a BR that probably isn't an issue, but on a BRe it can mean that the jib boom drops to, say, the side decks unless the crew is careful and it isn't ideal for my crew to have to control the jib boom when, say, we are dropping sails to anchor. If the jib boom does drop to the side deck then that causes a big drop in forestay tension and you sit at anchor with a mast pivoting in its tabernacle.
I used 6mm line and tied it to the D shackle where the jib halyard attaches to the jib. The other end goes through a clamcleat with roller (CL236 - Roller Fairlead Mk1 Racing Junior) at the aft end of the jib boom, which was conventiently left from the old furling setup when I switched to the new furling setup (
http://www.swallowyachtsassociation.org/?page_id=319). The line is kept close and parallel to the jib leech, which I think will mean it doesn't affect the geometry of the jib boom's swing, which could affect jib performance.
So far it has worked faultlessly. The jib boom remained raised and forestay tension constant when the jib was furled, and in use the jib moves as before. As a bonus, the tail of the line can be used to hold the jib boom to one side when the jib is furled, keeping the jib boom clear of the forward cabin hatch, etc.