What I'm wanting to do... Is if my wingman develops engine trouble in his P-47 behind enemy lines and skids in... I want to land my P-47 in the field next to his plane... Rescue him... And take off again.
Aside from the possibilities afforded by this new mod, you will have to keep in mind that n Il-2, you cannot always land a plane on a random field. Chances are the terrain will not be flat enough and even should it be, the game is very tough on landings outside of prepared airfields, invariably your plane will most likely flip over on attempting to land.
The landing characteristics of planes are, I think, contained in the FM, which is why that some aircraft - mainly biplanes and older types, or also recon types - have an easier time of landing outside an airfield. That is how they were designed and the game reflects that.
There have also been suggestions that from now on a whole map be designated a friction mod zone, meaning that emergency landings should be possible on flat terrain. However, as far as I know, no map has that feature yet. It is easy to implement however, should a map maker wish to do so.