Originally Posted by
spiliot
Just to add to the conversation, I manually load the aircraft and I've never seen any discrepancy or flying issues. Adding load and fuel via the FS menu is less convenient than pressing a button but still just a matter of a few seconds and some simple arithmetic (subtract the adjustment weight, divide by the number of load stations, add fuel and make gross weight matches the expected within a couple of hundred kilos difference). I use the FCOM for the THS value and all is set. The V speed calculations have to do mostly with weather conditions, gross weight and runway length and restrictions, so it shouldn't matter how you perform them (assuming CG is within limits, which it should be if you evenly load the aircraft).