Tasks / Calls reminder Time should not be set to 30 minute intervals

Tasks / Calls reminder Time should not be set to 30 minute intervals

Hi

My Team is complaining that when adding a Task/Call reminder they want to set them Time but they cannot choose the specific time because the system has it set in 30 MINUTE INTERVALS!!  

Is there a way to modify these time intervals?? 
umm I really dont get why do you limit us to that! is not very productive.