Regarding payrolls as I could see you have module containing three basic items (basic salary, deduction and contribution).
Would it be possible to enter database with assumtion of percentage of contribution, of course depending on domestic laws per country.
This way it might be easier to create payroll for many employees faster (this menu should go with as much employees as needed into one window).
It will be faster, this is idea and if you have time to implement these suggestion I could write more detailed template of how it can loook like.