TYPO3.Fluid

Currently custom view helper namespaces can be defined in the templates like
{namespace ns=\New\Namespace}

IMO it would be great to be able to configure the namespace in your package/extension configurations. That way you could easily replace custom or even fluid view helpers with your own implementation without touching the original package/extension.

Maybe we could even implement a fallback mechanism:

MyPackage:
  fluid:
    namespaces:
      f:
        F3\MyOtherPackage\ViewHelpers
        F3\Fluid\ViewHelpers
      blog:
        F3\MyOtherPackage\ViewHelpers

Now <f:link.action /> would try to instantiate \F3\MyOtherPackage\ViewHelpers\Link\ActionViewHelper.php and if nout found use \F3\Fluid\ViewHelpers\Link\ActionViewHelper.php

If that fallback mechanism is too complex, it might be a possibility to override only single view helpers..
AFAIK, in FLOW3 this is already possible by adding something like

F3\Fluid\ViewHelpers\Link\ActionViewHelper:
  className: F3\MyOtherPackage\ViewHelpers\Link\ActionViewHelper

to Objects.yaml. But I'm not sure if that would be the right approach here..