It's abvious that imagevue has has been built with Flash in mind. I have no problem with that But you are offering HTML mode as well.
With that in mind, you should put something like a "Flash only" warning on every configurable item in the Admin panel, that will have no effect in HTML mode.
True - The Html version was initially released simply as a fallback to the flash version. It is clear that they do not support identical features, so we may have to take it to another level in a future release.