It would be very helpful to get access to more of the dimensions / metrics available in this API – either through more pre-built reports, or the ability to build custom reports.
The highest priority dimension is Transaction ID. This allows you to join data on the standard Google Analytics connector data in transformation – making the MCF connector way more powerful. This dimension is stored in 'Interactions' in the documentation.
There are a few path dimensions which are missing from the FT connector. For us, the most important additions would be: mcf:keywordPath and mcf:adwordsMatchedSearchQueryPath to analyse how Paid Search / user search behaviour is impacting the conversion path.
Also, the paths are pretty complex when logged in the two tables (as nodes); I understand why, but it could be helpful to also provide the option to request the whole conversion path as a single string / row. Such as: "Email -> Paid Search -> Direct"