caching of thumbnails doesn't seem to take thumbnail size into account.
Change sizes and you get the old thumbs....

Option --autograb for feh to grab keyboard - so you can control feh without
having to focus it. Have to be a bit careful with this but could be useful.

Now we have 10 --action* options, would be nice to hit a key and get a text
overlay reminder showing what each one does :p

key/option/signal/timeout to totally reload filelist (rescan directories etc)

--draw-actions doesn't work too fine. It conflicts with --draw-filename and
misses some actions if there are non-defined actions in between

The "No more slides left in show" bug was fixed, but now there's a rare
condition (viewing a few images, removing them externally while viewing,
then resizing the window) causing imlib2 warnings.

--fmmode is neither documented nor implemented. Either implement or
remove it.