Count us in! Although I can see it getting kind of messy with updates in the future. It might be good to limit the overall number of fields that can be added and standardize their non-localized names.
I would also be in support of not allowing this at the user level, but having a more formal process and schedule for consortium members to request new fields in tables that get added on a regular schedule after an institution requests a change and at least one other institution “seconds” the motion.
Additional Fields in Collection Object Citations to support "Extended Specimens" is an active request I’ve made, I’m sure there are others!