Yet, every customization is two-folded:

Pro: 
- the creator can tweak one more thing

Contra: 
- behaviours could get too bloated to really make creating them as 
simple a task as it is right now. 
- localization 
- any additional feature may as well introduce limitations for future 
extensions

So for now, I don't plan to add it, although technically it's not too 
much of a problem.

Best regards, 
Felix