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There are not many limitations to form inheritance. One of the limitations is that if you have a  element on the super form you can not delete it on the child form, if you don't want to see it on your child form you can uncheck the visible property of the element. Another limitation is that you cannot insert new parts in-between existing, only after existing parts.

Inheritance and Security

bug at the moment.

Setting the super form on existing form (design or runtime): Parts( and elements?) defined on both child and super form: the super form parts are usedThe security of a form that is extended works like it would work if it was not extended, you can set security on all the elements you see on the form even if they are inherited. You have to set the security on the form the user uses and not on one of the super forms. In the security tab you will see from which form the elements are inherited. Image Added