Hi!
This came up already within another thread (see here: Installationsproblem wg Git / Composer).
As this functionality seems to me to be essential I am really astonished to learn that it is missing so far. I honestly wonder why it has been released with such a misbehaviour.
Anyway, shit happens… 
Well, can someone inform us if and when the community can expect it to be fixed?
Thanks a lot,
Steffen