Current configuration is not versioned, hence migration of features or fixing bugs in existing ones becomes cumbersome and requires ad hoc solutions. With configuration versioning in place this becomes as simpler as checking current config version against the required one.
Implemented in: http://git.claws-mail.org/?p=claws.git;a=commit;h=3b5b4f75ddf190346e4e8a1ee4521f32cafd0a37 Thanks a lot Andrej! :-)