I refuse to just say no without reading something, so here we go.
1 Out of all the windows I’ve entered through (with the permission of the occupants of course) I’ve never found one with a lock on the outside. Ever. It’s counter intuitive as they are not intended for entry and would just be another key to forget somewhere.
2 There is a page for this one.
3 I’m not sure what the plan is for this but it’s in the works (I believe) and I vaguely remember something about vision as a whole needing an overhaul which in turn would allow for a stealth system.
3.5 Light step is still quite useful. It reduces the sound you make when walking and grants a bonus vs traps.
4 Interesting, I don’t believe this subject has been touched on. It could give us a use for bath tubs.
5 See food poisoning. Asides from the farting and diarrhoea being replaced with vomiting we already have it.
While a rather negative response to the suggestions over all; I will admit it’s one of the nicer looking ones I’ve seen.