More Elemental conversion Support Skills and uniform behavior for Elements

For example, we have physical to lightning which converts physical damage into lightning. There should be something like that for cold or fire damage too for equality. Also gems like added fire should also have something like that for cold damage (I know added cold damage exists, but something like how added fire works but for cold damage based off physical). Then there's auras like hatred which offers cold damage based on physical while anger and wrath offer flat elemental damage. Could we get uniform behavior for the elements like these? Maybe keep the flat damage as an option, but just offer equal options for support gems and auras.

There is literally gem called Cold to Fire... :P I know you mean conversion gems, but it seemed funny to me.

GGG said they don't want the gems to be the same, so it is unlikely for them to create every element conversion gem and added gem.

That said, I rarely see anyone use Added Cold or Added Lightning gems (especially since Chaos adds bigger amount of damage paired with ability to poison...) and I'd love them to be improved. Making them all the same isn't the way imo.