> Is it possible to define the minimum dimension of a 
> file to be downloaded? the way the max is defined

Well, partially. The filter system can allow such 
things, but beware: this will cause broken links, 
because the size test is done AFTER the referer html 
file is being written!

-*.gif*[<5]

Will forbide all gif files smaller than 5KB

-*.gif*[<5]
+*foobar.gif*

Will forbide all gif files smaller than 5KB, except 
for foobar.gif