Scan mode works that way because a precompiled bitfile is downloaded to the FPGA behind the scenes to expose the IO.
The max update rate in scan mode is also 1khz, so I can't imagine you would want that kind of performance using your FlexRIO.
Why are you intersted in this? Are you trying to avoid compiling? If so, most of our analog modules ship with bitfiles in the FlexRIO Adapter Module Support.
Otherwise, you could try the FIDL Instrument Drivers, which offer an abstracted, DAQ like API for acquiring data.
National Instruments
FlexRIO & R-Series Product Support Engineer
