Hi Maciek, in my case yes, this is what we need.
We are now deploying without the help of guvnor, which was going to be introduced in a near future. I guess the whole behaviour can also be reproduced without guvnor. After reading your answer, it is worth advancing in this direction, and see whether the use of guvnor with packages and snapshots is the direct solution for this problem.
Thanks very much, we will report here the success of our work.
Jordi