I didn't see a command to see what I've actually sent and whatnot, or to get an idea of how quickly/slowly I'm producing relative to need

You can use the special combinators to see the current stockpile and requirements. I could add a command to print those as well, if you think that would be useful.

I'm adding a feature in 0.1.1 that will add the items consumed by Homeworld portals to the production statistics, that might help as well.

I don't actually check production statistics, so I'm not concerned in that respect. I can get to the combinators. Do the requirements and stockpile combinator directly output the signals for each "consumable"?

A command would only be relevant at the beginning, I saw somewhere about the combinators, but didn't know what they output.

Do the requirements and stockpile combinator directly output the signals for each "consumable"?

Yes, they do. They are effectively constant combinators, except the values are set and updated by the mod instead of directly by the player.