Um, the default is %TEMP% which is created by your user account.
And Windows users are unlikely to have manually installed a ramdisk driver and redirected %TEMP% to it... but if they did, they would know how to deal with it. So there is no need to worry on behalf of Windows users that thousands of files will clobber their RAM.
And you still haven't explained what is wrong with relying on calibre's temp dir (which must be writable for calibre to work in general, plugin or no plugin).
...
But if you really, really want to impress your users by writing and enforcing complicated instructions, go right ahead. I have no beef in this, I am just commenting on what I regard as shaky logic.
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