It's more or less curiosity on how to use a potentially EXTREMELY USEFUL script. Here is the command:

(vehicle_test_seat_list )

Ex:
(vehicle_test_seat_list warthog "gunner" (players))

So basically I'm trying to use this script to detect a gunner and once I do initiate a command list. Is what I take the script as true? What script should I use it in?

If you don't know what some script command does, I do the following:
0- Check the script bible.
1- Compile scripts in sapien with the command only.
(script startup whatdoesthisdo
(command_name)
)
2-Sapien returns text about what it expected, e.g.:
(wtf line 1) command_name requires exactly 2 arguements: blah blah
3-Plug in "stuff" for each argument
(script startup whatdoesthisdo
(command_name player0 true)
)
4-compile, sapien gives you what types it expected, returning whatever.
(wtf line 1) I expected a boolean, but command_name returns
5- Ask on the forums if it's not easy after that.

Actually, for that script, I'd probably make a biped get into a Hog turret, then in Sapien type the command and see if it returns true. If it does, make a Hog without a biped in it, try again, and if that returns false, then it probably IS exactly what it sounds like.

If all of the above works, then use it in a (if =(

Okay, thank you. I will try that.