1. left and right side luggage loading
Already there since many months.
2. Hand loading from the loader or the pilot (small planes and T props)
Possibly a GSX expansion product covering GA.
3. moving passengers from the terminal to plane
This a FAQ, so common that we also have it in the manual, and it was discussed countless of times on the forum, try to search a bit.
4. The correct amount of time for loading passengers - 2mins - 30mins
It has always been correct, because (as explained in the manual) the time is derived from the estimated amount of passengers on board depending on the actual station load of the airplane AND you can customize in the GSX settings how much a passenger takes to board, so you can customized it as you like, and it will always be proportional to the number passengers.