Have a list of improvements. More will probably occur

A list of filenames to ignore. The list should be persistent, editable, and one should be able to turn it on and off. Ideally provide a default list of known navigation filenames.

Provide a "no duplicates" option. Check for duplicates of each file once downloaded and delete copies.

File size minimum and maximum.

X and Y resolution minimums and maximums - by default 1,1 to something huge like 16,000 by 16,000