Hi Goldenrivett,
"Although I can find no reference to your statement in FCOM, I think they must be affected in the same way they move with changes in delta g."
It seems logical that they would, so my memory may well be wrong. Perhaps vilas, or someone else with access to the FCOM, etc., will find a reference.
Quote from Microburst2002:
"...speedbrakes reduce stall AoA
therefore V alpha max should increase accordingly, and VLS, too"
Yes. My tentative understanding of aerodynamics suggests that the airbrakes would, as you say, reduce the stall AoA because of the disruption to airflow. That would obviously increase the stall IAS/EAS. But the loss of lift resulting from the disrupted airflow would increase the stall IAS still further for a given weight.
The combination of these two factors may explain the great effect that use of "speedbrakes" has on VLS, which IIRC is simply a function of Vs-min.