I saw your posts on twitter, glad to see you're making progress!
I'll get the FAQ item updated. These are very new docs, so thanks for noticing. Similarly, we've raised a bug to have 'sandbox' added back to the sandbox UI, we're not sure what happened there.
The working group that came up with the research resource schema wanted to balance compactness with completeness, and resource amount and collaborators just didn't make the cut. As you say, the funding amount won't work for this as 1) it's funding item specific, not research resource specific, and 2) as you mention it requires a currency.
I'd love to be able to say that we will be able to revisit this metadata schema at some point, but that 'some point' is quite a way off right now. Updating these requires us to release a new API version as well as schema, and that's not something we've got planned for 2021. Hopefully, these issues aren't blockers for you, but we've taken notes so that when we do make a new API version, they're considered.
ORCID Product Director