OK! Some good news
and some bad news!
I found out that 0x02 is the code for the right mouse button.
I was able to make it the "key" for the "go-back" action (along with the Num_Pad 0) like this:
Code:
[Cmd7]
Name=Go_back_to_prev_cam
Ctxt=1
Key0=0x60,,"Num_Pad 0";
Key1=0x02,,"Right Mouse Button";
This works and you can then "back out" from the periscopes and UZO with a right mouse click. There is a problem, though. With this change in effect, *whenever* you click the right mouse button, you *always* "back out" TWICE. So, if you back out of the observation scope, you jump in very quick succession to the interior_aft_camera and then to the interior_fore_camera. Or, if you back out of the Bridge you jump to the Conning Tower and immediately to the Control Room.
So, until (if) this can be fixed, using the num_pad 0 key will have to suffice. (which is a wonderful innovation, nonetheless).
On a seperate note:
Another place to add a "go_back" command is the F7-Crew Management screen. You can access this screen from the schematic of the sub (located in the control room (aft in the Type VIIB, fore in the TypeII)), so it makes sense to be able to back out of this screen to the fore or aft control room.
Code:
[Cmd41]
Name=Crew_control
Ctxt=1
MnID=0x3F020008
Key0=0x76,,"F7"
Page=0x67000000,3742
GoBack=Interior_aft_camera;
BTW, I didn't test these, but the commands for Left Mouse Button should be 0x01 and for clicking the middle mouse button/wheel it is 0x04. I found these codes on this page:
http://irrlicht.sourceforge.net/docu/namespaceirr.html
(Look under "Enumerations").