small request for firewall "rules schedule"

hey, am hoping a simple thing like being able to schedule rules active/disabled within the firewall will be easily implemented.

i like the simple nature of the ess firewall, no anti-leak rubbish but shceduling of rules would be a handy feature.
for example.. there are certain rules i only want active during working hours - mon-fri, 9am-5pm.. the rest of the time,i would like the rules disabled.


cheers