Not that I am aware of. I typically see date of distribution as the determination date, and when I last looked at this I came to the conclusion that distributing an amount that exceeds $5,000 (or such other lower limit under the plan) would violate Section 411(a)(11)(A) (and/or the Plan), even if it was less than the limit on the date employment terminated.
I don't read the rules to require that the distribution be tied to termination of employment, so a plan could provide for cash out any time the benefit is reduced below $5,000 -- i.e., once the value dips below $5,000 (e.g., e.g. due loss of market value), it is distributed. For example, if a participant takes a partial distribution 5 years after terminating employment and leaves $3,000 in the plan account, the plan can now distribute this amount without the participant's consent. On the other hand I have seen plans that require the benefit be less than $5,000 at termination, so if an amount exceed that at termination but later decreases to below the limit, it is not distributed (and also would not be distributed if the benefit increases after termination but before distribution).