There's not much point as mentioned above, we do not need 2 keys since you shouldn't be able to do both.
If you want to set a certain key as R for Roar you can do that in the options menu, no need to make it default for everyone.
I rather have an actual swim up function there instead of a roar. But maybe you should be able to assign actions to keys? Just as you are able to assign emotes to numbers.
If more actions were added in the future, me finkz su.