I wonder whether it might be helpful to make that point in the product description?
One compositional observation I could make is that such a long reverb poses some interesting challenges and opportunities for the type of music one makes to work with it.
In the longer term I will need to figure out if it is possible to generate any surround-sound (such as binaural) mixes with MIRPro3D if the audio is being exported from Sibelius.