This is a list of helpfull keycombinations.
If you find any other good combinations to help editing
Object´s just post a comment with an introduction. If i write something wrong just correct me also. Thanks for reading !

"Not Spawned Items" means Items that arent placed into the map


Grid
hold strg to move items in a grid. The grid are 1x0.5 to the next same object.
.
.
.
Rotate
press r and scroll your mousewheel

Mode
You can change the mode of editing by pressing:

• w (Postion)
  
• e (Rotate)
  
• r (Scale

.
.
.
Copy
You can copy object by pressing "strg + d"
In my opinion its the bst combination.
.
.
.
Corner
You can locate to a coner for scaling by pressing "v"
The cordinate jumps to the postion of your mouse.
.
.
.
Jump
You can Jump to the front of an object by pressing "f"