Footpoint identification was requested. This is a work in progress in collaboration with the WSA Dashboard team: https://ccmc.gsfc.nasa.gov/community-tools/WSA-Dashboard/
Current PFSS field likes in JHelioviewer are precomputed, it was requested to be able to choose parameters for points that are traced.
It would be great to see a view of where the observatories are in space especially for those not on the earth-sun line. e.g. show a top down solar system view of spacecraft.