I think you're right in both suppositions. Keep in mind that "scripting" is a verb that has been appropriated for use as an adjective here: it describes what one does with the language. As such, how it is used is central to whether or not that label (scripting language) is applicable. That's my take, anyway.
One need not necessarily use a different development methodology when scripting as opposed to doing more "permanent" programming, but it would probably behoove you to allow differences in approach for these differing tasks. The differing methodologies are indeed implied (at least in tendency and efficiency for the task), to some extent, without being "laws", so to speak.