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I think I came up with an "easy" update for once, that could be really useful.  I say easy because the program already calculates what I'm asking for...

I want to be able to add a keyframe for a specific file index frame.  I know you can render an animation that starts on a specific frame with the file start index, so I know its possible.  But, I don't know how to get that single frame into the main window so that I can add it back as a keyframe in the animation.

This would make it easier to fix things like going through a solid object.  Or, you could make a straight path, then go back and add points along the path, and move them a little bit to give it a little back and forth or camera changes.  The general idea is that you could go anywhere on your animation path and add another keyframe.

I was picturing something like a button after the other keyframe buttons:

• insert actual parameters in this keyframe
• add a new keyframe in between
• add a new keyframe for a specified frame index (pop up with number entry box?)

Maybe there's a way of doing this already that I haven't thought of?

Assuming we are using the bezier interpolation, inserting a new keyframe out of a subframe would change the flightpath because the keyframes are not necessarily a part of the flightpath, whereas an already interpolated subframe is a part of it.
That makes this type of manipulation more tricky, i guess.. have to think more about it.

Anyhow, inserting a keyframe inbetween and modifying it afterwards might be easier then starting from an existing keyframe.

Yeah, I realize that the points before and after the new midpoint would actually change the bezier path.   That's why it couldn't be an automatic function, like "split keyframes", without using a different approach.

It wouldn't make everything easy, but it would be better than trying to find a midpoint yourself.   In fact, you could just change the animation to linear for a minute, get your midpoint, then change back to bezier, as long as you understand how those points will perform with the curve.  Then, your midpoint would be a true mid-point, and not dependant on the frames before and after.

Basically, I want access to the data that is already being generated for each point in the path.