Hello Scott,
yes, sorting can be done. Not complete list probably (because Unicode items in beginning of the list should be always there as most used). Is is just unsorted, but probably you are right it is code page id order.
Would be done in new beta.
The name US-ASCII is official, not from me. Read from windows settings. I am not create names by myself

.
BTW:
this can be useful for you. You can filter not needed code pages or create your own list

Best regards,
Alex.