Is your feature request related to a problem? Please describe.

It's not super common but comes up consistently, some people want Auras that are only visible (or occasionally more subtle differences like text becomes visible etc.) when you mouseover the frames.

Describe the solution you'd like

A Global Condition for mouseover.

Extra points if you could specify a frame rather than only the Aura's region itself (though, of course, default to the Aura). This would mostly be used when people want to affect a whole group when any part of the group is moused over.

Describe alternatives you've considered

We've had a snippet for a while that uses `aura_env.region:SetScript("OnEnter", function() frame:SetAlpha(1) end), etc.
I think there's now something in place that clears Scripts like this from Aura regions? In any case the above is a fairly hacky method that doesn't make it easy to change the properties that are available in Conditions.

That's unimplementable. The only way that would fit into WA as a subregion. But a subregion can't change conditions, they are only changed by conditions.