Press H key to place a marker (Hold the key to place multiple)
Press V to delete the nearest marker (Hold to delete multiple)
Press Q and E key to rotate the marker that you want to place
CTRL + 1, 2, 3, 4, etc. --> Selects group 1, 2, 3, 4, etc.
ALT + 1, 2, 3, 4, etc. --> Activates/deactivates group 1, 2, 3, 4, etc.
Keypad 0 --> Delete ALL markers on the map (including those in the base set)
Numeric key 1 --> Activate/Deactivate the markers present in the base game (So NOT those placed with the SAE mod)
Key 2 on the numeric keypad --> Delete the markers placed by the player (So those placed with the SAE mod)
Key 5 of the numeric keypad --> Select the previous group
Key 6 of the numeric keypad --> Select the next group
Key 7 of the numeric keypad --> Activate/Deactivate the selected group
ALT GR to show the number of placed markers
Left alt: To see marker through walls
CTRL + S --> Create a quick save of the placed markers
    (Warning, if a quick save already exists for this map, it will be overwritten!)
CTRL + F --> Load the quick save if it exists