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Hmm, well at the moment I've got about 5 inches of telescopic post poking up. My one Brompton commute has made me think I'll probably just leave the telescopic inner bit at the right height and drop the outer bit, then just extend the outer to the max when I want to ride it. That should save buggering about getting it at the right height and I can't see anyone complaining because the saddle's sticking up a few inches. I'll measure it and work out if a longer ti one would do the trick.
Got an inch or so to play with (as it were) by flipping the saddle clamp.
TurtleRecall-
One day I'll actually work out what the optimum height is for my Brompfication titanium post (it doesn't have the flared end like the real Brompton one so it has no end stop), chop it to the right length and make up a stop for the end of the seat post. It's been something I've been meaning to do for a long, long time and never got round to. The lack of an end stop means I do occasionally unfold the bike, hop on, and then wince as I discover the saddle's about 2 inches higher than it should be. The curse of short legs...
Brommers
Nope, they just do longer posts. It means the saddle doesn't go all the way down, but means you have a longer post.