using a lock two lock two projects, each a matrix, the plugin not only disallows concurrent building of the two projects, but also of their configurations.

Say I have

project A with axes x,y
project B with axes x,y

and A and B share one lock, that lock prevents A::x from building if A::y, B::x or B::y are building.
Instead I'd like the lock to prevent building A::x when B::x or B::y is building.

I guess this needs a new type of lock that works project based, not build based?