I seem to recall that in earlier versions of Photoshop, it was possible to do simple math calculations when inputing numeric values into dialogue boxes or options tools. For example if an existing value of a parameter (like a width) was 7.87, then to halve it you could enter 7.87/2
In a way, I've answered my own question under Photoshop CC, because it rejects the math operators. Is this a feature that was taken away?
Some scripts and Plug-ins may be able to handle input like that. However I would think that most would expect just a integer or plane numerical value. Programs can parse and evaluate parameters pass to them and even prevent invalid data like a / ina a dialog field where they will only accept a numerical value. Other will simply reject what is passed if it is not what it expected. There is not a standard one way the input fields are handled in dialogs. Not all dialog you seen in Photoshop are programed by Adobe. Users and third Party vendors also program Plug-ins abd Scripts you may use in Photoshop.
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