Re: "a pressurized hold is crew-accessible so as to deal with live cargo"
Where did you check? For example http://blog.tsa.gov/2013/08/tsa-travel-tips-tuesday-aerosols.html says to put aerosols in bigger containers in checked baggage. I, and I guess many others, never had issues in packing such items.
The only limitations I know about are for specific dangerous items - i.e. oxygen tanks. Anyway, specific goods may be only loaded in specific holds.
Temperature in the hold is another matter. Some holds have heating - which could be turned on or off depending on the cargo. Others may just blow air from the cabin to avoid temperature going below 0°C.
Biting the hand that feeds IT
