I know this only affects the top 1%, but I think that more double the price of titan we should get a bit more than just a few commands, god being the only really useful one. I think that they should reintroduce /thor for immortals, but make it island only to prevent griefing. Griefing was the main reason that these fun commands couldn't be added, but now that staff can easily limit it to islands, like jump and spawnmob, then griefing isn't a problem and thor could be used for fun. I think that /tree could also be a cool introduction to immortal rank, because it couldn't be used to grief and isn't too over powered because a sapling does the same thing.
I think there are a couple donor ranks in need of some additional perks. We can treat these as donations, but they're honestly just purchases. Overlord is extremely not worth it for double the price of God, and Immortal is $400. God is a good permission, but I'm sure some other perks could be added.
/Thor enables to people spamming it on their island and creating a "Who is using /thor" in global message, as the lightning sound is heard throughout the entire server. /tree, which I assume makes a tree, needs a penalty cost just like dancing on a tree does. I do agree Immortal needs more perks, but there can be better options to be found that they should add.
