Why do you want them to change into a new tab, there in the polygon's tab already, the extrude options are next to the split poly option.

also for the others look in the mesh and edit mesh in the polygons menu set.

For other things that you cant find, have a look in the search function of the help files, thats what I did when I upgraded from 6.0 to 8.5, it tells you exactly where they are.