Difference being that Lightning redirection was actually a skill mentioned, taught and used a lot more often than the redirection of actual Fire. Iroh said it himself; it was a technique he came up with when studying waterbending. Redirecting something isn't as logical or easy as you guys might think. Water works very differently from fire; firebenders don't need sources, and make their own fire, whilst waterbenders will always bend the same, shared substance: water. This is why it is often redirected in the show, they bend the exact same thing. Perhaps, using that logic, it wouldn't be even possible to redirect fire that isn't your own because of that. (The atla movie was actually very different from the original show; firebenders could only bend fire from sources of fire. Iroh was the only one to be able to "create" fire: he said that one can create his own fire if you exchange your own chi for it. Misalignment of two firebenders' chi might be another reason why one can't bend another bender's fire)
And if it is canon - which I seriously doubt it is, it happened once over the course of 7 seasons worth of episodes in a very insignificant manner - you have to take into account that this plugin won't and can't represent everything in the show. Element's identity, move balance and technical limitations from minecraft have to be considered with plugins like these. Giving Airbenders the ability to fly isn't as easy as just giving them /fly, for obvious reasons. Making an Airblast, Fireblast, Earthblast and Waterblast with the exact same damage and controls, just with different particles, would be a no-go; elements need to be different and keep to their own identity, water's being versatility and change. Redirection is treading on that very territory, and I don't approve of this suggestion because of that.
