How possible is it to have a toggle between rating on a 5-star system rather than a 10-star system? Yes, I know I could just use up to five of the possible ten stars, but it’ll always look weird to have those extra stars. 
To answer the question in your topic title: no it is not possible to switch to a 5 star rating in our apps.
I guess it would become 5 stars with the possibility of “half stars” so we can keep the 1-10 rating working and syncing across all devices a user might use. But I don’t think a switch to 5-star rating is in the stars (I’m sorry for that bad pun).
You could also just always pick between just these options: 0, 2, 4, 6, 8 or 10 stars 
Totally fair. Just figured I’d ask. 