http://www.koubalink.com
will get you some pull rod info. Don't bother going there right now, as it's 'under construction'. Big help, 'eh??;)
I recall you could get
more'n 2cm drop out a set of them (the 'long' ones. I don't recall exactly how LONG those are). Give 'em a call to check for sure. Phone? I dunno. Hopefully their website will be back up soon.
Devol's only drop the rear about 3/8" inch or so.
Michelle makes an excellent point:
But the best way is to stop falling off & learn to read the terrain for where to stop
It may be hard to start the bike (probably take some left-footing), but once you're up and on, you'll be a MUCH better rider if you ride WITHOUT the crutch of sticking your legs out.
The seat is a big + on the kdx. Take a spin on an orange-crusher and you'll be loving the kdx seat!
Oh, Devol's pullrods DO require KX250 bolts and washers. Those bolts run something like $15 each! They are 'adjustable' in that an insert can be removed/reset to give you oem/+/- lengths.
There's an added advantage to a longer pull rod. Actually, the reason for a longer rod is
NOT primarily to lower the bike, but to change the leverage against the shock spring. It smooths it out a good bit. With a good bit longer set, you may be needing a heavier spring.
Be sure to reset your sag after you put ANY pullrod set on.