Since ClamWin uses the scanning engine provided by the Clam AV people, I suggest you contact Clam about this. Their page is at http://www.clamav.net/lang/en/
on the web. Luca Gibelli is probably the person to contact. They may be interested, if they can get beyond the fact that Clam is primarily for use on Linux email servers.
The Clam Sentinel Project (http://sourceforge.net/projects/clamsentinel/ on the web) provides a pretty good set of heuristics for ClamWin users that employ the Clam Sentinel real-time front end scanner for ClamWin.