We should be able to add a condition to control the visibiliy of custom actions
Just today I had to put a custom action and I had to put the condition on the workflow rule condition. Customer is complaining because many users click on the button but no action is executed due to the condition put in the workflow.
It should be useful to hide the button if user has no permission to use it.
So there should be a condition on the creation form of the custom actions..