Thanks for the interesting comments... to me Eden is an IDE already... and having to go to another tool outside of the application I'm already in seems like a less streamlined workflow.
Most of us who do a ton of scripting already open an editor that is in full screen outside of ArmA anyway (re: Poseidon, Sublime, etc.) and takes us away from the main mission editing views and tools presented inside ArmA. Why not have those pieces "Integrated" with the rest of the mission editing toolset presented inside Eden? For example, one benefit would be that "plopped" assets in Eden that have assigned variables can be immediately recognized and supported as a part of the editing experience and could help reduce script errors...