Programs like that exist, but if you've got a computer you might as well use a digital mode, even RTTY, rather than Morse. Morse was designed to work with extremely primitive equipment, no computers, no microphones even, just an on-off switch that you flip on and off. There is a traditionalist excitement in using it that would be lost if you had a computer do everything. I remember finding a beautiful RAF telegraph key in a junk shop many years ago and I had to buy it even though I had no use for it. But I have no idea where it is now.