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The issue with setting the random seed and number of buildings in the BRAILS widget was addressed in R2D version 4.0.0. This new version of the R2D is currently only available on GitHub, but the installation media should be out soon.
On another note, I am able to run this query using the BRAILS backend just okay. If you are familiar with Python programming, I may be able to help you get this inventory using the BRAILS backend. The backend has several additional options that, in some instances, allow for better inventory generation. For example, for your region, by changing the source of the footprints, I am able to get an inventory of 1695 buildings (instead of 119 buildings as obtained from OpenStreetMaps).
Please let me know how I can assist you better!