In some applets a parameter can contain a reference to a 
file I would wish to download. I think you could add a 
simple mask where the user could type the name of the 
parameters HTTRACK must explore in search of file names to 
download (I think it would be sufficient a list of 
parameters, separated by , ). That's an enhancement toward  
perfection of yet the best downloader I know.
Thanks, my best regards