Hi Jaimie,
It will cap at zones 4-5 weekly, although this will only be done by the back office. That means you may be overcharged on the day but refunded later on. If you only make 2 rail journeys in a day then I don’t think you’ll reach the cap anyway. Any buses or trams you need will be covered by the zone 1-3 travelcard so won’t be charged.