So far the IB bridge is rather limited to what is essential for the typical use case of fully automated trading, somewhat trying to mirror what is available with FXCM and via the MT4 bridge.
However, the IB API itself is more tailored to what is required for trading with official exchanges worldwide and there are some different use cases worth supporting such as support for manual or semi-automated trading which might be preferred by some users or even more suitable for specific strategies or instruments. E. g. one might want to open positions manually but then have Zorro monitor/manage them automatically. This would require Zorro to be able to read all open positions, including those opened externally. The Zorro IB bridge is not supporting this so far while the IB API itself does well support it. Another feature I would consider very useful is reading all contract details via the bridge.
More generally speaking, the Zorro IB bridge could be extended to offer arbitrary IB API features e. g. by somehow wrapping all IB API functions into brokerCommand() calls.