Why Script-only stacks?

[mrcoollion]

So I am playing with revIDESubscribe and I would like to catch the message send when a I have changed a script and push the Apply Button.
Cannot get that to work .
I thought

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revIDESubscribe "idePreferenceChanged:cRevScriptSize"

would do it (in On OpenStack) and then use handler

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on idePreferenceChanged pPreference

. But no luck
Most other messages I can monitor e.g. when I save the stack.