Hi,
I did a basic mockup of this a while back. You can currently attached a view point anywhere on an aircraft. I added the OSD (on screen display) as a flat plane mesh with opacity texture, but a javascript method is needed to call the current camera angle from script in order to set the pod to rotate with the camera view, which would be necessary for many implementations, such as the MQ-9 Targeting Pod. Alternatively you could use 2D overlay for a simple OSD, using HTML/CSS/JS, which would work much better at the moment.
You can currently zoom in/out by going hitting Esc key --> Menu --> Graphics --> FOV angle, but I would like to implement a method to zoom in/out with +/- keys. Outerra has no problem with LOD at various FOVs, if fact it adjusts to the LOD to compensate for angular resolution.
Hope that answers your questions.
Regards,
Uriah