@WalterMadelim, thanks for you interest in PowerModels!
First, it is best to make feature requests in the PowerModels github issues so we can debate and track them all in a common place.
Regarding this feature specifically. It am not immediately convinced this is an essential feature for the basic data utilities in PowerModels. The objective of basic data utilities was to provide a small collection of features that would support teaching of the most common power system analysis workflows. I worked closely with a few professors in the US power system community to determine what should be included or not. The incidence matrix as defined was determined as an important standard to support, as it supports workflows for computing PTDF and LODF matrices). I can imagine that your proposed branch_from_to matrix is useful, but if it is not a widely adopted standing in the power system classroom, then it is not a good fit for the basic data utilities of PowerModels.