I often travel from Wil to St. Gallen and back on the same day. I hold a travelcard for zones 915 and 916.
If I want to buy a single way ticket, the app recognises my travelcard and suggests a ticket from Uzwil to St. Gallen.
However, selecting a retour ticket, I can only buy a ticket with all zones included (Wil to St. Gallen). Hence I need to state Uzwil as my starting destination.
A nice and useful feature would be that my travelcard is recognises as well in the retour mode.
What do you all think?