http://mcmmo.wikia.com/wiki/McMMO_Wiki

Mcmmo adds rewards and skills for tasks completed

It does not greatly impact gameplay but it gives players something to work toward and players often enjoy having it

Marking as in progress as it will likely be implemented on next donation (costs money for plugin)

Correct.  Although marked as 'In progress' consider it more 'On hold' until we get the funds.