I really have no idea what I'm doing, but blundered around for two days and came up with this:
This works, although I haven't figured out how to get the fuel truck to work. It positions where I imagine it should be, but nags to use the airplane's fueler (which I am assuming is the Fuel and Passengers App, but I think it's looking for something else). Anyway, avoid the fuel truck by (1) NOT beginning with Boarding or Deboarding, which will trigger automatic services if that box is ticked in GSX settings; (2) unticking automatic services (see below) or (3) under option (2 above) just don't ask for the fuel truck. Or if you still want it, you'll have to bail from GSX to make it go away, then restart it to select pushback.
Copy below into notepad, then save it
as just gsx in
C:\Users\YOU\AppData\Roaming\Virtuali\Airplanes\CS_L-1011-1
START COPY
[aircraft]
nosegear = 18.18
refueling = 1
battery = 1
pushbackraise = 1
pushbackdummyevent = 0
pushbackcheckengines = 1
iscargo = 0
trafficcones = 1
preferredexit = 0
wingrootpos = 2.87 -0.76 -0.34
wingtippos = 23.77 -11.25 0.92
fuelpos = 3.00 -7.51 -1.72
waterpos = -0.50 -18.25 -0.94
lavatorypos = 0.00 -18.25 -1.19
gpupos = 1.50 20.49 -1.82
engine1pos = -10.67 0.61 -2.44
engine2pos = 0.00 -12.19 4.88
engine3pos = 10.67 0.61 -2.44
engine4pos = 0.00 0.00 0.00
[exit1]
pos = -2.48 21.90 -0.16 17.00
code = 1
name = Exit 1
embeddedStair = 0
[exit2]
pos = -3.01 7.25 -0.04 -0.00
code = 1
name = Exit 2
embeddedStair = 0
[exit3]
remove = 1
[exit4]
remove = 1
[service1]
pos = 2.61 20.68 -0.16 -6.00
code = 0
embeddedStair = 0
[service2]
pos = 2.99 7.25 -0.29 -0.00
code = 0
embeddedStair = 0
[cargo1]
pos = 1.69 12.75 -2.19 0.00
code = 2
name = Exit 2
embeddedStair = 0
uldcode = AUTO
[cargo2]
pos = 1.69 -10.36 -2.19 0.00
code = 2
name = Exit 2
embeddedStair = 0
uldcode = BELT
[cargomain]
remove = 1
STOP COPY
Here are what my settings look like under this setup. If anyone has a more elegant solution, please advise.