Is there a non-hack way to add my own QWeb directives?

Question

I come from a Django background and an app can register template directives and they are available to all other apps (there is a central registry basically).  Is there a way for my app to register a  new Qweb directive/tag?
For example i may want to create something like: <t thumbnail="{'image':o.image,'format':'90x90 bw'}/>
So, is there a way to hook up extra directives  to QWeb?

Konstantinos Metaxas · Accepted Answer

I'm answering my own question here but the solution is not that hard.
You can take a look at   https://github.com/OCA/server-tools/tree/8.0/qweb_usertime which does exactly that.
Basically override QWeb model like you would any model, and define your own render_tag_<tagname>() method.

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