Our plan is to eventually look into allowing users to define their own buttons, which would let you create a new End Turn button with control over whether it was at the beginning or the end of the list.
In the meantime I wrote a short fix - you'll need to download this as a .js file and place it below IsiahCardGameCombat.
IsiahCGCEndButtonIndexFix (EDIT: for anyone else wanting the same thing, please use the updated link posted further down the thread instead)
This code will move the End Turn Button to the beginning of the list of options instead of the end.
There will be a graphical glitch while you're using v1.2.2 which our upcoming update should fix - the button won't highlight properly in v1.2.2. Everything else should work just like you want it! Let me know if it doesn't.
-Isiah