Hi wiqvist,
Some of it is 'all or nothing' but other things are optional, like indicated, the AI traffic for example.
The VHF chatter can be turned on or off aswell, for those that do not like to hear it, or want to turn it down or off where it's not appropriate. (you wouldn't expect too much 'harbour chit chat' when sailing in Antarctica, for example).
An interactive radio menu with selectable messages to send, that's not in the making unfortunatly. It was suggested before, on occasion. But nothing concrete on such a system ever really emerged. I'd personally like that too.
As for the stairs, I agree it's more realistic to be slower on stairs that on a flat equal surface. However, I must say, for me personally, it became annoying after a while, to want to go to a certain spot of a ship to get my eyes on a docking manouvre or something like that, and be seriously slowed down by a bunch of stairs.
So it's not too bad for me, but still a good point, the old way was more realistic.
Regards,
Fred