Ok, I know there's plenty addons out there that allow you to simplify the 'assign raid icon to target' with a key combination. But does anyone know if there's an addon out there that allows you to target a specific raid icon? If there's no addon, can I do that with a macro instead?

I don't think there is because I can think of any way to determine the raidIcon without targeting each unit manually anyway. I can get a units raidIcon but only once you have either targeted or mouseover them and you would still have to click the mob manually anyway. I'm just thinking of the API off the top of my head... I just finised a small tooltip addon for myself and went through it all recently.