I asked for an 'undo' button or similar before for when an FC is added but you reckoned that this would have to be implemented across the board for all actions. My specific problem is I'm always creating flashcards by accident and I've juggled the toolbar around but still keep doing this and then have to open up FCs, go into Manage FCs, search on Uncategorized (or whatever is the default cetegory) scroll down and select the unwanted FC and then delete it, before closing it all to get back to the dictionary.
I agree that an undo across the board would be a major undertaking, likely not worth it and would perhaps be the result of a plethora of unwanted behaviour. However, would it be possible then to have either a contextual undo option appearing in the list of FC categories (the list of categories that appear when the FC button is held down), or perhaps an optional Gmail-style undo option on the "Card Added" window that pops up when a card is added? E.g. Instead of: