Given that git/config will have information on remotes and maybe costs, it might be a good idea to do a simple round robin selection of remotes to download files where the costs are the same.
This of course assumes that we like the idea of "parallel" launching and running of curl/rsync processes...
This wish item is probably only useful for the paranoid people who store more than 1 copy of their data.
done, at least for
git annex get -JNwhen two remotes have the same cost..