senthor wrote:1. Is there a "real" bf2142 editor or do you too only use the buggy bf2editor with custom mod?
you can use the bfeditor without BF2 : http://www.fsmod.com/fsforums/viewtopic.php?id=6617
senthor wrote:3.How to include an loadingscreen background image
for the editor it is in the ...\Battlefield 2142\bf2editor\Background folder.
If you spoke about the map:
for the minimap, it's in the info folder, and for the backround image, you need to create a menu_client.zip folder like this:

after, you need to copy and paste the clientarchives.con file in the mod to your server.zip folder and add the line:
fileManager.mountArchive levels/thenameofyourmap/menu_client.zip Menu
Above lines:
fileManager.mountArchive Common_client.zip Common
fileManager.mountArchive Menu_client.zip Menu
fileManager.mountArchive Sound_client.zip Sound
and add in the same folder, the line :
run Clientarchives.con in the Init.con file
Above lines:
run Heightdata.con
LevelSettings.InitWorld
run Terrain.con BF2Editor
run StaticObjects.con BF2Editor
run Sounds.con
run Sky.con BF2Editor
run Editor/GamePlayObjects.con host
UndergrowthEditable.create
Undergrowth.load Levels\thenameofyourmap\
run Overgrowth/Overgrowth.con
Overgrowth.editorEnable 1
run AmbientObjects.con BF2Editor
run Water.con
I hope that this will help you.