Best way to disable a specific validation rule

I have a certain validation rule that I don't want to apply in one
particular cirumstance.
The rule is based on allowing a user to create something, if they are
the 'owner' of an assoicated model.

The rule works fine most of the time, but I want to override it for a
certain usertype. This user type has its own set of actions defined by
routes.

So, to disable the particular rule, I am doing this, in the action
'usertype_add'

unset($this->Model->validate['other_model_id']['userOwnsModel']);

Where userOwnsModel is a custom validation rule I have setup in the
model.

This seems to work fine, but feels a bit 'hacky'.

Is this an accepted soution in cakePHP, or are there any better ways
to handle this?

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