The new cord (as recently replaced by Andy) is total of 104" (264 cm) and 28" (71 cm +/-) from nano to dimmer. Pretty sure this is what is being offered as replacement cord at Epicvape site. Cord is also much more pliable. Dimmer doesn't move quite as easily as my old one, but still can be moved if bumped. However, don't seem to bump it nearly as much with the added distance to the nano. Don't know if I would consider this optimum (or if I would engineer it the same), but is MUCH better than the original cord IMO. I'm pleasantly surprised how much difference this 10" makes (if my old was same as yours - measured it once but don't remember how far). So much so that I never even think about it anymore, and that has been my only gripe with the nano from the beginning.
I haven't opened mine up (before sending for new cord & tweaks or after), but from pics posted way back in this thread there are crimp connections at the nano end. Looks easy enough to open it up (2 screws on bottom), clip the old cord off and crimp on the new one. So there would be no soldering necessary for full cord replacement, just a little clipping, stripping and crimping. As explicitly stated here and on Epicvape, if you do this yourself you will void the warranty.
If dial bumping/moving is a problem, a rubber band can help. I used one from a lobster claw (heavy, thick, yellow rubber band) with great success. Think one of those blue broccoli rubber bands would work well, too. I used to just leave it right on the cord and slip over the dimmer as needed. Do note, this will wear your numbers off the dial pretty damned fast.
I clear coated my dial with finger nail polish as soon as I got the new one, but don't know how this would hold up with regular rubber band use (haven't used one on new cord at all). Think it does look pretty cool with the high gloss shine on the dial, though!
EDIT: I just looked and can't find the replacement cord on Epicvape anymore, so don't even know if still available. Going to leave rest of this post as is, just in case. Figure Andy will probably be through here at some point with more definite details.