Segregation of Tor and Other Software Bundles
I see benefit in the separation of the modified Firefox and the Vidalia Bundle.
Separating the development of safer, standalone clients (e.g. Torbirdy) and the Vidalia Bundle would enable users to mix-and-match and use said software with either a system Tor or the Vidalia bundle. This would allow compartmentalization of the development as well as lower the entry threshold for the development of new hardened software.