This makes sense to me in general. I like the fact that it's simple and vendor-neutral. Do we want to hardcode "panel" in the name? Are we sure that this will ever only apply to panels? Do we want to use a name which reflects the intent, rather than the mechanism? In other words, something like "color fidelity" = "preferred" maybe? (I don't know, just throwing ideas around.) Would be nice to add documentation for the property in the "standard connector properties" section.
