I agree about the Inkosi washer design - best in the business. I love the design, which is stupid-easy to maintain and to tune to one's own pivot action preference - standout best there is (although the Umnumzaan is virtually the same in this regard).
I have a few of things I personally would change on the Inkosi if I could:
1. Clip angle - I probably am in the minority here, but I would prefer the clip oriented like a Sebenza 21. I actually like that it follows the lockbar in that configuration, making the clip less prominent in the hand with the knife open. In fact, I find the upturned tip of the clip on a Large Inkosi (my size preference) to be in exactly the wrong spot - right in the middle of the grooved location your finger is force into. I've actually considered buying a replacement CRK clip to shorten and re-bend to get the tip out of this finger groove location. Milled aftermarket clips help grip comfort a lot here, but sacrifice the excellent function of the CRK clip.
2. Finger Grooves - I personally like more neutral grips, and this is EXACTLY the knife I would prefer to be more neutral. I would definitely like the Inkosi more if the "tips" of the grooves were basically eliminated, as in flush with the level of the scale just before the rearward most groove. The "inward" scallops I don't mind, but the proud tips I would prefer to omit.
3. Stop Pin (Post, actually) - Love the "pass thru" design, it is brilliant. Doesn't influence the pivot action or blade centering, aids in positioning for reassembly, and is a standout feature. However I have had mine loosen from the mounting screw through the lockbar side, which makes me wish it had the same hex socket on the front as the rest of the screws so it could easily be held in place to tighten the mounting screw.
4. Thumb Studs - I love you CRK, but your thumb stud design is, well, not great. Look to the Spartan SHF thumb stud please.
Oh, come to think of it, all four of the above have previously been addressed by Chris Reeve Knives - the Umnumzaan.