Indoor staircases are a central point of home architecture. Yes, it is also important to look after the security aspect of a staircase. Casting out huge entryways and substituting them with spiral railings is a nice idea. You can also augment the spaces with new stairs. If stairs are eating away the space you had earmarked for other kinds of remodeling, go for a spiral model. A pull down staircase or a flexible one can be used for opening or closing the staircase. These are attached to the attic doors.

While trying to give a look to your stair, keep in mind the entire architecture. You shall either contrast or synchronize the staircase with the adjoining areas.