Welcome Bob. Steam sounds are limited at the moment. I'd like to see more of them, but I believe Ring is putting his focus on the diesel side of things for the moment, since that's where a majority of users are. The steam sounds aren't bad, but there definitely needs to be more. And currently there is not support for a cam input for chuff rate. The LM-3S has the capability but Ring has not yet designed the programming for it that I'm aware of. To set the chuff rate requires a good amount of work with speed tables and such. Not my favorite method but it works.
Like the others said, Railpro is all about ease of use. That's what drew me to it in the first place. I love using it and am happy with the recent updates. I would like to see more sound releases soon, but Ring will get to them when he gets to them.
-Kevin