Choose/When/Otherwise in Targets

``/``/`` is a nice feature that allows replacing complex conditions with what is effectively a switch-case-default but can only be used on the project level and not within targets.

Can this be changed to work within targets?
This would theoretically conflict with tasks being named `Choose`, are there any ways to deal with this? - like (and I feel bad suggesting this) optional xml namespace for `` and prefer a task named `Choose` if defined.