I second this feature request, because it would solve a problem I am having with recurring scheduled maintenance windows.
You have to schedule the recurring window using your default time zone. That causes a problem in the United States, where some time zones switch between Daylight Savings Time and Standard Time. My server clocks use UTC to schedule a maintenance process, so twice a year, I have to log into Site24x7 and edit the maintenance window because the local time changed by one hour relative to UTC. I could work around this by using UTC as my time zone, but that makes other tasks more complicated, because I would need to do time calculations in order to set an "ad hoc" maintenance window.