Most of these aren’t supported at this time and I’ve opened some issues for them.
As for the jumping steps, you should be able to click on the step numbers. If you’re looking for something a bit different we can open an issue for that too.
I use the stepper to propose several forms to modify the ad account of a user.
I would like to mutualize the first step that is each time to ask the id of the user account to modify, but each form doesn’t need the same amount of steps after that.
For example, It would be nice to be able to force the stepper to move to the last step instead of the next step if needed when we click on the next button.