Right now Multi-store has two options:
1) different, independent BRM systems.
2) One BRM system, but with multi-location features enabled.
This is pretty good, but both solutions are kind of extremes, extreme independence, or extreme collaboration.
There has always been a demand for a solution more in the middle of these two extremes:
different BRMs, but sharing the same inventory (and location aware)
Here is our current working diagram:
The clever bit would be 1 online booking across all locations, but each store has it's own BRM.
The bikes are central, location aware, and can be moved around.