Quote Originally Posted by LeonKeyh View Post

From a programming aspect it is completely different, because the use of Geirskogul puts you into Life of the Dragon and then is replaced with the ability that can only be used in Life of the Dragon. It would be more difficult to program this with MCH unless you had 2 separate abilities (One that ate 50 heat gauge and put you into overheat and one that can only be used in overheat), unless you just make it "This ability costs 50 heat gauge and grants 'Overheat'" and have Overheat be "abilities that cost heat gauge are free for the duration".
Ninja has a ton of gcd swaps that are conditional, and summoner also has gcd swaps that change back to normal on timer. Warrior has Fell Cleave which costs 50 to use but is free during Inner Release. They already have the code for it. They might have to add or remove couple of lines.