Yes, devol makes adjustable length pull rods. BUT...you are only going +/- 1.5mm or so. In the 'longer' setting, the bike drops only about 3/8".
Kouba is an outfit that makes pull rods that will drop the bike further. DO be sure to set your sag correctly after installing aftermarket pull rods. Notice that their idea of 'correct' sag is not the same as 'common knowledge' sag (100mm a good starting point). That's cuz of the effect the rods have on handling of the bike.
From:
http://www.koubalink.com (for the KDX)
..and will lower the rear of the bike approx. 1.125 inches with the KDX1 links, 1.625 inches with the KDX2 links, and 2.25 inches with the KDX3 links.
***edit***
Take a look at the FAQ on the kouba site. Some good points there about increasing pull rod length and how it benefits bike handling. Basically increases the leverage against the shock spring making the bike more pliant over whoops and such. Of course also may make you 'need' a heavier spring due to increased leverage.
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Oh..the devol rods REQUIRE KX250 bolts and shims. The bolts are only about $15 each!! (two required). Last I checked, devol left that bit-'o-fact out of their advertising.
Enjoy!
p.s.
It's not so much a matter of 'natural balance' as it is going f-a-s-t enough that inertia works in your favor! Hard(er) to fall down when you're screaming like a proverbial bat-outta! It is much MUCH easier, balance-wise to ride FAST than it is to ride SLOW.
Now then...about that WER damper.....;)