I found this in feh's .desktop file and liked the idea:
With `--start-at` feh will load all files from the directory of the
given file and start the filelist at the given one.
This of course breaks easily if I want to pass more flags before the
file argument, but is easily fixed by first specifying the argument to
`--start-at` and continuing with the rest. I also rarely use any flag
besides the one already defined in the alias.