My suggestion would be, to enhance the bracketing possibilities in all cameras. The stock bracketing is limited to 3 or 5 exposures with pre-set steps. I would appreciate an option to set the maximum number of exposures (i.e. 3, 5, 7, 9, ...) as well as step sizes (1/3, 1/3 + 1/2, 1/2 + 1, 1, ...), which will be used in the standard bracketing-drive-mode menu.
For my personal taste, up to 9 exposures with 1EV step size would be sufficient.
By the way: if the bracketing sequence reaches an exposure limit (i.e. 1/4000s where bracketing would go to 1/8000), there should be a warning displayed in the camera!
I know that there is an app available, but the app is far from "professional" as it is advertised. If it would be professional, the app would support any number of exposures with any step size (at least in the range of 1/3 to 2 EV)