I recently stumbled upon this Youtube called MetalJesusRocks, and the guy whose channel it is used to work for Sierra, in the phone support section.
He hosted a little reunion party for other people having worked in support, and while it might sound really dull to watch... it's actually quite interesting!
They talk about which games were the most work to support, and which ones were the easiest... and Kings Quest 7 is mentioned several times as being one of the very worst ones as it was apparently incredibly buggy when it was first released (mine wasn't as far as I remember, but then again I didn't buy it right away and maybe the European release was more polished..?).
It was actually so buggy that they started including patch floppies in the game boxes! :D
Anyway, here are links to the two parts -
Sierra tech support reunion part 1/2
Sierra tech support reunion part 2/2