You can already control it (and any other RPC API miner on the network) with MultiMiner. You just need to configure it to allow API access from your IP. From looking through the MultiMiner thread it seems like you already have that working. AFAIK there is also an update for the firmware that makes it work properly with stratum proxies. What features are you looking for that are missing?

I do plan to work on native BFGMiner support for the S1 but I'm not sure that will change much for MultiMiner.