Capabilities of LotRO UI

[asmkm22]

I have a few questions regarding the limitations of what can be changed in the UI. I'm not looking for examples or tutorials on "how" but just "if" this stuff is even possible.

1. Is it possible to reskin game icons? I've seen some examples of bag icons being changed, but can the same be done for inventory and skill icons?

2. Can you create UI events in response to another event, such as combat skills used by an opponent? For example, flashing a warning up that says your health is low, when you reach x% or something.