Time limit question

Hi,

 

I've noticed that the minimum time limit I can set seems to be 1 hour.  Is there a way to set it to 30 minutes?  If not, could this ability be added to the next update please?  My 3 year old is allowed 1 hour a day to watch TV.  But he also uses the computer to watch cartoons as well.  So i'd like to scope it in a little.  I think the same would make sense for the time ranges too.  We don't necessarily need minute level control.  But I do think half hour options should be introduced to both time limit and time range.  It would be useful and grately appreciated!

 

Thanks,

Jimmy