how to mod maneuver nodes

[Riot9330]

So for awhile now, I've had this great idea

when you make maneuver nodes there should be an edit box that has the numbers of the altitude for periapsis and apoapsis. 

So instead of guessing the altitude of the maneuver you can simply enter the numbers into the edit box and get the precise ordit you want

 

Does anyone have the slightest idea on how to accomplish this?

[FancyMouse]

Edit box, the ability to read/write the nodes - you can refer to other mods like PreciseNode how they do the job. That's the easy part.

Calculate the exact node vector based on some other number - that's pure mathematics, and the harder part. In principle it should be just rotate a given ellipse (determined by your input Ap/Pe if I understand correctly) so that it intersect your current orbit at the node, then calculate velocity difference. Velocity should be easy to calculate once we know the orbit and the current position on the orbit. Some orbital mechanics, basically.