You have pretty much covered most of the canon bending techniques.
Firebenders can also redirect heat as shown by Sozin in 306.
For waterbending ice is not a special ability, all waterbenders can change the state of water and still manipulate it.
With Bumi he can bend Jennamite, which is a type of mineral that grows in Omashu that happens to be edible, basically Avatar World Rock Candy, we also know that earthbenders can bend the glowing crystal in Ba Sing Se.
As far as Glass goes, it doesn’t seem that useful as an ability. Earth or Metalbending would cover nearly anything bending glass could do, plus glass is brittle.