Hi
FPSC does not really support any sitting animations. The sit script thats around in the forums and on some other sites is a trick. It uses an animation frame of the climbing animation. It really is very difficult to get a convincing sitting npc with this method. You could of course add some own animation frames to the desired model.
I know its not very helpful, but hey, its FPS Creator...
Greetings, Snake67
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i5 2.8 GHz 64bit / 4G ram / W7 home sp1 / geforce gts 250
FPSC 120 Beta 3