Wouldn't it be nice to the have a local variable page like the global variable page.
Front panel objects are local variables but sometimes it is not always desirable to see this local variables. There are three options around this: 1) put the local variable off to the side side of the visible display, 2) make the local variable hidden, or 3) use a global page. By putting these variables on a global page they are no longer local and be be changed by other VI's. The scope of a local variable needs to be limited to the VI that uses it. While it possible to use the first two workarounds and make local variable hidden or put them off to the side it makes the front panel messy. Things are complicated even more because if local variables are double-clicked on the block diagram because it brings focus to them on the front panel and this can be a problem if the front panel has a status bar or a toolbar and things are carefully arranged.
Another possibility would be to enhance the functionality of the block diagram constants so they can be variables.