> is there an 
> option to get all *.jpg or *.gif and override this?
The only solution is to override robots.txt ('Set 
Options' / 'Spider' / spider: no robots.txt)
But ensure that you don't clobber the bandwidth by setting 
up limits (Set Options / Limits and Set Options / Flow 
control)

You can also add additional scan rules (Set Options / Scan 
rules):
+*.jpg +*.gif

But these rules should be activated by default