Good news! Worklogs - Time Tracking and Reports team have just released a new version, and since you use Jira Server you can decide to upgrade at any time! All that is needed is a click of a button in the Apps management screen on your instance!
New features:
As a Worklogs user I'd like to save and use reports
As a Worklogs user I'd like to manage my saved reports
As a Worklogs user I'd like to select one of the saved reports as a default view
Fixed bugs
Error when I try to log time - ‘We were unable to set original estimate’