A new update over on the Atriarch site talks about custom specialty skills:

Player-designed specialty skills... You mean I can make up my own skills in the game!?!  Last week, we announced that we have coded the foundation of the Atriarch Skill System.  We mentioned that there are the Basic Skills and Specialty Skills. This week, we have expanded the functionality of Specialty Skills to include Player-made Specialty Skills. This is how it works... nearly every Action in the game has an associated Skill.  If it does not have a Skill yet, then the game makes one up for you.   How cool is that?  More specifically, it makes your character a unique Specialty Skill based on how you are using the Basic Skill.