When Plugin or webstart are asked to run a JavaFX 2.0+ app, the class com.sun.javaws.JfxHelper is used to detect if the correct version is available, or to install it.
This class pays no attention to if The Client Stack is "disabled".

We need to decide on the correct behavior here.
suggestion:
1.) If JavaFX is installed but disabled, deployment code should not use it and not try to re-install it.
2.) If it is disabled and not installed, we can either:
2.1) install it (wich will now automatically enable it) or
2.2) refuse to install it.