My scripts end up in their own folders inside mIRC's, but I rarely ever use $mircdir. As mentioned, $scriptdir is more helpful. If the user wants the stats in its own folder as shown, then there isn't any reason why that cannot be done.
As far as spaces in filenames... if you use an identifier, spaces don't matter. Otherwise, they do and you'll want to use $qt() or else $+(",whatever,") to deal with it.
