First, I think there is an error in the manual.  Page 284 fo flight manual says:   
"Select gun pods by pressing the [RCtrl-Space] key and confirm weapon selection on the HUD and WCS panel; two gun pods will be selected. Set the ripple interval/gun pods mode to FIX mode and the ripple quantity switch to PO2. 
If the aircraft has four gun pods loaded onboard, press [LCtrl-Space] once more. Set the ripple interval/gun pods mode to FIX mode and the ripple quantity switch to PO2."   
Is the above a typo?  I dont' think RCtrl-Space is correct.  Shouldnt' it be LCtrl-Space?   
Anyway, in FC 1.12, I used to be able to press fire and the gun would automatically lock the vertical axis when I used programmed mode.  However, in FC2, it doesn't seem to work and even when laser is on, it seems to work as fixed depression mode.   
Any ideas?