At the moment it's only possible to update the custom fields using this API. Please can you update the API so that it's possible to update other columns in the table. I understand that some fields may be more complex to implement than others, so even partial expansion of this functionality would be appreciated.

We use APIs to make complex updates in BBGM, potentially saving hours per update. The more columns we can modify through the API, the more changes we can handle this way.