> Can I set minimum size of file to download? thanx

This is generally NOT a good idea for ALL files ; but you 
can use filters, like in:

-*.gif*[<5]
to exclude all gif files smaller than 5KiB

-*.gif*[<5] -*.zip*[<30]
to exclude all gif files smaller than 5KiB and all zip 
files smaller than 30KiB

or
-**[<5]
to exclude ALL files smaller than 5KiB (EVEN html files 
with links inside! Warning!)