HT has used remotes before for some figures like ED-209 for the audio effects. And for the Batman Armory, theres a remote to turn on the lights. I was hoping it would become a regular feature but they havn't gone back to it.
It must be really complicated to design because each of the lights on an Iron Man figure are not inter-connected. They each have individual switches. Because you can't have wires going through a figure with so many moving parts. So each light would need its own remote. Or possibly one remote with a dial to change frequencies to respond to individual receivers for each light.