Thank you for your post.
A script parameter is not visible in the Button Setup window, as the other options "Do Nothing" and "Single Step" would not apply. Clicking the script icon will reveal the parameter.
I recommend posting this request to the Product Ideas board at:
The Product Ideas board is monitored by Product Management and Development. All feature requests are discussed and considered for possible implementation in a future release.
if one has to rework an interface with buttonbars/buttons, one drives really mad with that unfinished stuff (this IS nice talk - hi Mark). theres no need to increase security when you can easily destroy Your data because of interface errors (remember the double-shortcut for running scripts and redefining search, cmd/ctrl-r...)
well, well... will create FR (when I'm done with interface work)