Feature suggestion: support arguments for GIT_PROXY_COMMAND & core.gitproxy

Could /connect.c be patched to support multiple arguments in ENV[GIT_PROXY_COMMAND] and git config core.gitproxy?

For instance, something like :
  GIT_PROXY_COMMAND="myproxyscript arg1 arg2"

or (way more useful):
 git config core.gitproxy \
  '"myproxyscript -mode git -proxy joey@gw.myhouse.com -proxy joey@bastion.foocorp.com" for foocorp.com$'

Its slightly annoying to maintain and distribute custom copies of myproxyscript that carry the repo-specific proxy arguments inline just because git won't pass those arguments itself (arguments that a repo's .git/config can easily store).

I think supporting tokens (ala ssh's ProxyCommand - %h=repohost, %p=repoport, %u=repouser) would be awesome, but that change would not be backward-compatible with existing .git/config files or GIT_PROXY_COMMAND utilizing-scripts. Its enough to assume that "$host $port" will always be appended to the gitproxy arg list.

Thanks for reading, (and thnaks for git!) -joey