[graph-tool] Betweenness centrality with parallel edges

Hi, I remember asking some time ago whether graph-tool computed BC with parallel edges and Tiago pointing me to the BGL interface. The answer is the BGL does take in account parallel edges in the computation of the number of shortest paths. However, the normalization factor in graph-tool becomes meaningless when networks have parallel edges as the star is no longer the benchmark network. Tiago, would it be possible to include a flag in graph-tool so we can choose to compute normalized/non-normalized betweeness? Many thanks, Rui