Not against more floors at all, but there is a roof. Considering the limited area around the hotel, sniping from atop two extra floors would not be a great time.
That is because of the time of day and that part is actually quite beautiful, especially when looking out on the river.
The beach is already inaccessible!
Agreed. It is really stupid and poor level design that Jackie gives you her key card but you are still trespassing and she will report you as such if you are in her room when she returns.
It isn't silly at all. They do not give him a different outfit, but the maître d' of a hotel would be at the front desk and should recognize his staff, just like how in Paris the CICADA heads and Viktor know all of CICADA security.
One thing dude, your list got confusing for a second because you combined your suggestions with your complaints (hence my joke on #4)