There are tons of homonyms/homophones in Mandarin and this can be problematic when using Skritter because as of now there's always a default reading that is used, which of course isn't always the reading we're learning.
Examples: 調 can be read diao4 or tiao2 .
My suggestion is for for users to be able to choose/indicate which reading they'd like to study when coming across these characters with multiple readings. It would also be good for users because it would make certain that they aknowledge that those characters have more than one reading, so as to make a mental note in case they see it other contexts