You would have a support for two Blender versions :
Yes, of course you can let the author know about your feature request at this particular forum post* (https://blenderartists.org/t/1147534).
However, there is no absolute assurance that such feature will end up in RADarr, as it also depends upon the feasibility and scope of the overall project.
*Even you can report your bugs at the same forum post or join the discussion with the other users to share your experiences and et. al.