An object can have it's surface area extended by using a variety of different gadgets to create a vault prompt on it. Basically, if an object is not anti-vaulted or anti-landing zoned, and the object is too small to vault normally, it would be where a vault extension would be useful. A vault extension can also work if and object is anti-vaulted, but not anti-landing zoned. You can do this by simply putting a shield in front of the vault extension.
Credit: Universally Found
List of confirmed ops that can VE with their own gadget (so far)
Attackers:
Capitao (Patched)
Nomad
Gridlock
Iana
Ace
Zero
Ram
Grim
Osa
Fuze
Sens
Kali
Thermite
Hibana
Ying
Defenders:
Valkyrie
Ela
Maestro
Kaid
Mozzie
Goyo
Wamai
Melusi
Thorn
Azami
Fenrir
Lesion
Tubarao
Mute
Alibi
Smoke
Denari
Proven Universal Gadgets:
Defuser
Bullet-Proof Cam
Proximity Alarm
Player
Smoke Grenade (Patched)
C4
Shield
Breach Charge
Hard Breach Charge