Interactive Poses and "jammed" keys
Inside the "Penetration loop" the only editable keys are those "linked to a valid target" (connected, that is). Editing of any other key is disabled in fact (changes are reverted while moving to a different frame). Such keys can only be assigned inside the "Normal", "Orgasm" or "Cooldown" loop, and this fact alone results in severe limitations. For example, disabling inertia to emulate more realistic physics is simply impossible in Interactive poses. The relevant keys cannot be edited in the Penetration loop and, unfortunately, anywhere else they'll just look awfully out of sync most of the time. By the way, this appears to be the main reason for the necessity of inertia.
Camera position/aim and model size
The key values for camera position/aim and model size are strictly related.
Choosing the wrong size (meaning, any size different from the one set at creation time) will change the intended perspective of a pose. I used to wonder why each actor had its own camera keys...
Well, now I got my answer.
I suggest a little experiment to make things clear.
In PoseEdit, start a new pose with at least two actors.
If they are all the same size, they will be overlapped in the starting pose. Set the camera keys as you like. Now check the camera values (hotkey: CTRL+A) and you'll find that they are all the same (not surprising). Now go in customizer and change the size of the models. Leave one model at default size, for the sake of comparison, preferably actor #2 (for reasons). Using one of the main presets 6'0/Default/5'0 will make it easier to restore the original sizes afterwards (unless you don't care).
You'll notice that actors smaller or greater than default are translated from their original position.
Translation in this context is generally harmless, while rotation has issues because limbs of smaller/greater actors are rotated unevenly and the pose is deformed. A good practise I suggest is start a new pose with all sizes set to "Default", move/rotate the group where you want it - using the "All Persons" manipulator - and set the model size only as the final step, before starting the real editing. The same trick should allow to move a pose (involving different sizes) without deformation, I think. Back to our experiment...
Despite the translation, you'll notice that the camera keys are not affected. So what?
Let's try to move the actors back in the original position (marked by actor #2, default size). Once it's done, hit SHIFT+R, set again the camera keys and save as a new pose. Check again the numerical values of camera keys and you're in for a surprise (values are now different, therefore they depend on the model's size).