[bojan]

The Moon is ~60 Earth radiuses away from us.
If we have two observers at the opposite points of the globe (that means the other one should be somewhere in Europe or USA or south America), the distance of view points will be less than 1/30, which may just be enough, besuase for good stereo effect humans need at least 1/20 [5cm (eyes distance) over 1m of distance from eyes].
So, libration is still the way to go, I believe, to produce significant enough result without relying on other people which adds to the uncertainty of the outcome...
It may be intersting to try stereo on some big feature like Clavius... It is not hard to calculate the times when photos must be taken but with weather conditions etc it is a bit hard to predict the completion date of the project :-)
However, someone may try to do images of the terminator during the one whole lunar cycle, and then wait for good conditions to take another one of the pair.
The project is doable, it only requires a careful planing. But one should not expect too much from it: The terrain on the Moon is very smooth, so even the maximum libration may not be sufficient to show the 3D effect properly..
Maybe one day (night) when I am retired... :-)