Any skills that are in official are completely possible to add in Aura.
The reason they're not already implemented is because they're not currently being worked on (other than gunner skills, which are "unofficially" in the process of being worked on).
https://github.com/aura-project/aura/wiki/Getting-started
You can definitely mention other emulation projects. And according to Google, you're from rAthena. A few of us, including exec (Aura founder), have worked with RO emulation.