My eod data download doesn't include any fundamental data like MC or #Shares on Issue. But I know that Amibroker has a data download app called AmiQuote that lets you download fundamental data from Yahoo. Once downloaded you can directly access that data from the AFL (Amibroker Formula Language) level. Hence, yes you could use any of this fundamental data in your scans.
I haven't ever tried this but there are instructions and examples in the User Guide that show you how. I believe you can enter this data directly and also import it from an ASCII file as well. Not something I've tried so I don't know how difficult it would be.
This fundamental data is as of the date downloaded as well, i.e. not an array with history.