After the topic is overflowing with ideas I wanted to share my idea (maybe we could make some progress):
- create a shortcut which opens an invisible editbox (new item)
- typing 3 digits (only digits are allowed), for exampe 001 for course 001 / 1 meter depth
- create a script (.py) which get the digits and "send" it to sth like Game.SubmarineCommands.ExecuteCommands
- script clears the edit box and close it