Are you sure sometimes it never comes down? For practical applications I agree, a speed limiter would definitely be a bonus - but I've managed a speed of 299 maximum and it came down after around 20 seconds or so at that speed. Unless you've gone higher? :-)

Sorry, I haven't had a chance to test this out yet! Is it just with actors that extend the Wanderer class? I thought it worked ok for me when I tested it... I'll have another look at some point.