As an aside from reading the thread, barring any reason to think otherwise I would normally assume that a verser's spirit can find his body by following the scriff sense, as long as the two are in the same sub-universe. I recognize that it's really outside the bounds of the pseudo-rational explanations I use for most scriff-related abilities (because the spirit by definition cannot contain scriff), but it fits the general pattern concerning the necessity of keeping the spirit and body together.
On topic, part of the point of the limitation on haste is to ensure that any attempt to push the envelope excessively in a somewhat lower bias curve would take massive penalties, and thus be limited if you couldn't do a time stop. If you take a haste to the rate of roughly one minute per second, you're looking at a -60 penalty (for 64 seconds per second), which means you're not going to do it unless something is strongly in your favor or you're really desperate.
My impression is that if the character is attempting to achieve an effect comparable to time stop, it should probably be the same bias as time stop--justification, in psionic skill terms, can be found in such skills as the non-corporeality skill, which in essence says that however the effect is achieved (OBE, dematerialized body, etherealness) it falls under the same bias heading.
I might bonus the character slightly if it appeared that the rate at which time passed was great enough to become a limit eventually, but even at one minute per second I don't see that as particularly limiting. In the specific case, I might provide a bonus if the skill is limited to accelerating a non-material form of the character.
Overall, though, the skill appears to achieve the same effect as a 14@8 stop time, and I can't think of a good reason for it not to be at the same bias.
--M. J. Young