Problem:
When creating a form you have the option to lock certain parameters in that form under the "Behaviour" section. This makes the chosen parameter dependant on another True or False parameter.
The problem is that the "enabling parameter" has to be "True" to enable the parameter.
Idea:
I feel when choosing your "Enabling Parameter Name" you should also have an option to choose "True" or "False" as the enabling status.
Example:
I use this a lot to give standard parts the option of being "Custom Parts"
If you have a standard item with standard dimensions you can create a True or False parameter called "Standard"
then if the parameter is False then it will enable the parameters in the form which will change this from a standard part to a custom part.