[powersurge360]

This is a limitation that I haven't really found a way through. I haven't tried too hard though because I've found that I can often just let the complicating set up have the 'plain' github.com host and use the custom host for the other set up. If I found that both professionally and personally I needed submodules, though, I'd probably be in trouble.

Also, if the submodules are public, the plain host will work fine because it doesn't matter what key you authenticate with.