Do I know you? :D
So what you are proposing is that ALL projected income for a month should be allocated to some category? Not sure I like that. It’s not as flexible as the current free form assignment.
I do like the extra entry option to assign the entry to a particular account even if you aren’t on that account page. That would let new entries be added from anywhere without having to switch over. You could possibly show all entries on all account pages just labeling them with $0 or something to help remind users they are there… of course that will start to get messy if the user has a lot of transactions.