Exported SQF's don't specify stance when exported. When those units are imported their stance is locked to standing. You can manually change their stance to kneeling or prone if you use the remote controls but once you release control they will immediately revert to standing and the facing they had when they were imported.

Additionally, setting the Stance on the individual infantryman or on the group (by double clicking on the unit or the group) will display that you have changed their stance to prone/kneeling but the unit will remain standing.

Their facing is locked in the direction that they were exported in. You can SHIFT+Left Click the unit to change their facing in Zeus or Remote Control the unit but as soon as you release the mouse button or UAV controls they will spin back immediately to the direction they were facing.