It truly depends on what works best for your group. It is a individual group decision, if you require two signatures and the president is always around you may choose to have them on. IF your president is the one who gets most of the supplies for events that is another reason why. There is no set rule...
In our PTo we have a tresurer but from what i was told the President isn't allowed on the account, I was hoping anyone would know if this is true or not?