As I said earlier, the "79 cent fix" worked at one time (I doubt it still does) on some earlier YZ250F models because when the clutch stack was new (particularly when using some aftermarket plates that tend to be thicker than spec until used a while), the springs were at or very near coil bound at full lift. I have no information telling me this was ever a problem with the WR450.
Koolaid most likely didn't bother to replace each spring in the self same hole it came up out of, but he might have. If not, the "cure" that was effected was probably a simple matter of shuffling the springs around into an arrangement that was more evenly balanced.
As far as YZ springs go, most YZ450's will drag enough that it makes starting in gear difficult if not outright impossible, but they should not, and normally don't creep in gear. Here's something that I've done that seems to have made a real difference. I ordered a clutch plate set for my '06 from one of my sponsors who is not an engine guy. His parts supplier pointed out that the clutch kits Yamaha offers are cheaper than just the friction plates alone, and talked him into buying one. There were a couple of things wrong with that. I have a Rekluse Z-Start Pro clutch, so I have to use their steel plates, which I had already bought from Rekluse, so I had no use for the steels or the springs in the kit to start with, only the friction plates. The '06 uses 9 friction plates, while all the later ones for which full kits are made use 8, but since the Rekluse uses 8 in all models, that didn't matter either. The real "problem" was that the kit was for an '09 YFZ450R (quad), not for a YZ450F, and the plate part numbers were different.
A YZ450F uses 5TA-16321-00-00 plates, all 9 (or 8 in my case). The kit had two of those, but the other 6 were 5VY-16321-00-00. I ran the part number and found out these plates are the ones used in an R1. My first concern with these was obviously not whether they could handle the power, but that they were very slightly thicker, and when stacked up, the plate clearance when disengaged was a little close. Nevertheless, the clutch releases a lot more cleanly than the OEM set up, or than the previous Rekluse setup, either one, and I can now usually start it in gear unless it's heated up to the high end of normal.
You might want to try a set of those, using the 5TA plates on the ends where they run against aluminum, and the 5VY plates in between. See what happens. The kit would give you quad clutch springs, which you may not like, but clutch springs are $23 a set, so it's not a real big deal. The plates have been working very well for me for 6-8 months now.