I’m not sure you understand, (or maybe I didn’t your answer), EnableDsUiOnly is a capability, a feature that a twain device can support or not support. CustomDsData is similar, it’s a feaure that a twain device may or may not support. If your Ricoh supports both of these, you could save yourself a lot of time by traking advantage of them instead of trying to manipulate the device’s capabilities one by one – this is partialy in response to your question about setting the feed from code.