Editing via shortcode variable?

Is it possible to allow the toggling of edit functions by making the edit="true" a variable? I have a user-editable table on one page that doesn’t always need to be edited, but will always be used to select values to paste elsewhere. I tried adding a selection box to my search form, and a POST reference to the shortcode, but it doesn’t work. Here is what I tried:

<form name="test" action="" method="POST">
...[other elements]...
<select name="edstatus">
<option value="true">Enabled</option>
<option value="false">Disabled</option>
</select>...[other elements]...</form>
[cfdb-datatable...{filter and atts}
...edit=&_POST(edstatus)]

This code is treated as if edit="false" regardless of what the value of the selection element is. I didn’t know if I had the syntax wrong, or if what I was trying to do was just not possible.

Thanks!

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