Here's my thoughts on the OP's suggestions:

1: It'd be really useful to not have to switch to the tank and check regen in between DPS spells when you're trying to be efficient.
2: I could see it being useful for some UI layouts. I personally wouldn't benefit from it, but that's just how my UI is set up.
3: That'd be nice, though I doubt they would ever do it with the devs' stance on healer DPS as it is.
4: This. Get rid of the stupid animation locks and delays, not just for Rescue, but across the whole game. Most of them are completely unnecessary. Many, many actions across all the jobs feel very unresponsive because of this. For those who don't know, this is why things like Benediction and Hallowed ground go on CD but don't activate in time sometimes.
5: Would be nice if they did it.

To add some of my own:

1: Make it so Raise can't be casted on someone who already has the status effect on them. Would at least eliminate some of the overlap, and its super easy to implement.
2: If not the above, make some easy way to tell who the other healer is casting raise on, without having to target them specifically. Sure, there's the aggro lines, but you're not going to see that in the middle of a giant pile of mobs blowing up. Maybe put the initials of their target on the cast bar or something.
3: WHM specific, make the lilies useful somehow. I honestly make more use of PI than lilies.