Possible to add endtag and include inner text as fallback?

[SuperCrunch]

Not an issue but would be cool to have.

So, if you don't add anything or you delete text, the site text will be used as fallback.

For example:
{% flatblock "My Awesome Block" %}

Title of Something

{% endflatblock %}

This will by default, use

Title of Something

if nothing is added or if text is deleted.

[renyi]

I don't think I'll have the time to do it anytime soon, would be nice if you can help.