I would like to see better developer documentation in Koha; this ranges in scope from cleaning up POD errors (easy), adding POD to modules and scripts where it's missing (moderate), to documenting the weird and wonderful corners of the holds queue or Search.pm (hard).
of the 403 '.pl' or 'pm' files in master:
30 pod syntax error
49 does not contain any pod commands.
324 pod syntax OK.