Change definition of a view

Hello,

one question: Is it possible to add or remove a column from a view without
drop the view and recreate it?

If one or more rules depend on a view, it's very hard to extend a view.
I use the following procedure to extend a view:
- drop depending rules
- drop view
- recreate view with additional column
- recreate all rules

Any help is welcomed!

Thanks,
Andreas Roth