Hi there- right now you could do this by adding a fee to the POS and then adding the fee from the POS during check-out. You can add POS items to the admin checkout page. 

Hi there- this is a setting in General Settings. It appears that it has been disabled. Check this box and it will show again in the payment page

All great thoughts! Let me provide some additional detail on these.... 
3. Custom fields- We show this on desktop. But i agree, this would be a good improvement to show on the app, too. will add this to our list of improvements. 

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1. Check-in on mobile app- I've sent this to our developer to review. When testing this on my app, the blue check-in button turned green immediately without navigating away. I'm concerned that it's being slowed down by a lot of data and not appearing like it's instant. 

2. Court X + Y more: This displays this way because we have clubs who assign MANY courts to an event. At one time we only showed the first court, but there was a desire for it to indicate that there were many courts on the event. There just isn't space to show every court. If the player is assigned to an individual court on the event, it will only show their court assignment.