The 707-300 v1.0 has auto spoilers. Someone pointed out that the 707 never had them, so they were removed. It's all manual now. But you can put them back if you like. Just edit the aircraft.cfg (back it up first!!!) file. Look for the following section and modify the line I have shown.

[airplane_geometry]
auto_spoiler_available=1     //auto_spoiler_available=0

It is cheating. But....

Mark