Ah of course, now I know what you mean. The fumble die field has plenty of room for a number modifier, but the crit die is a little more crowded. I will see how it looks. It shouldn't be a problem for the crit/fumble roll to check the birth augur and apply the lucky roll modifier, but maybe that's too much going on behind the scenes. I think there is always a balance between convenience and confusion when it comes to the automated bookkeeping.
For now, you can drag the lucky roll modifier to a hotkey, but then you just have to remember to click the hotkey before making a crit/fumble roll. Or just double-click or drag the lucky roll modifier each time. Not ideal, but it works.

