About the issue to format the controls inside a form, it seems that we are not able to format all the controls at a time. Just as you said, we need to format each of them individually.
May I suggest you submit an idea at PowerApps ideas Forum about this issue, other customers who have the same request would vote your idea at here:https://powerusers.microsoft.com/t5/PowerApps-Ideas/idb-p/PowerAppsIdeas
Best regards, Mabel Mao
Yes, choice columns are always also a bit fiddly. Much more robust to create a separate list of choices and then do a lookup.
Fill out a quick form to claim your user group badge now!
Find out where you can attend!
Features releasing from October 2019 through March 2020
Learn how to build the business apps that you need.