I believe what no1mad was alluding to was that on a diamond-frame bike, assuming proper saddle adjustment, one cannot put both feet on the ground while in the saddle; they'd have to move to over the top tube and even then due to the weight shift that can be scary when doing it in an emergency. Meanwhile on most (all?) crank-forward setups, you can plant both feet down without moving your butt out of the seat. This might be enough for the OP to be satisfied without having to go to the wider stance of a trike, or it may not.