Most of these things have been suggested in some form or another, so I’d encourage you to do a thorough forum search to see what discussions have been had regarding these ideas. You can also find links to many of them here:
Multiple transport modes will definitely be implemented in the future along with the possibility of multiple levels (much further down the track though).
As to managing the hotels, I think that has also had some discussions but a few forum users don’t want it to become ‘Hotel CEO’ so we’ll have to see.
Thanks for sharing your ideas!