service inheritance

[Pablo Lalloni]

Is there a way to accomplish an inheritance-like relationship between services?

The case is I would like to customize BuilderFactory service by changing the implementation of some of its facets, though don't want to miss future improvements of BuilderFactory nor duplicate all of its spec on my app sdl...

Is there a mechanism that allows me to -say- extend a service and override some of its specification?

Is this posible?