It's been continously said that any memory sharing scheme between a client and wineserver won't be accepeted, ever.
You're the second person to make that assertion without pointing out the relevant discussion. Such assertions are not helpful.
You need to make wineserver multithreaded then, and that idea has been shot down as well.
Yes, either wine or wineserver will need a thread to set these values with the required precision.
The current question is whether turning on such functionality via a registry setting is acceptable, since it is clearly not okay for the general case.