Specifying a private key when connecting to a remote SSH repo

It would be very helpful if you could specify the path to the private
key to use for ssh remotes just like in ssh.

git push origin master -i 'path_to_key'

Althought there are workarounds involving ssh config, if you have a
server that has hundreds of git repos, each with the own private key,
those workarounds become unusable.

This is a very popular request with thousands of comments about it, for example:

http://superuser.com/questions/232373/tell-git-which-private-key-to-use

http://stackoverflow.com/questions/3496037/how-to-specify-which-ssh-key-to-use-within-git-for-git-push-in-order-to-have-git

Thoughts?

Thanks!

Breck Yunits
breck7@gmail.com